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A.A.R. Car Codes

 

An explanation of the Mechanical Designators assigned by the Association of American Railroads to freight car types. Listed are only the codes used during the Great Northern era. The 'Used in ORER' column reflects issues of 'The Official Railway Equipment Registers' in which that description is confirmed to have been used.

 

A.A.R. Freight Car Classes

Class Type Class Type

F

Flat Car

R

Refrigerator Car

G

Gondola

S

Stock Car

H

Hopper

T

Tank Car

L

Special Car

V

Ventilator

M

Maintenance of Way

X

Box Car

N

Caboose

 

 

GENERAL NOTE: Any class of equipment having special heating appliances for the protection of commodities against freezing, to be covered by affixing the letter "H" to the designating symbol (3/1928, 1/1941, 7/1943, 1/1949, 10/1957, 1/1968, 1/1969)

 

 

 

 

Class "F"

Flat Car Type
Code Used in ORER Description
FA 10/1966-4/1990 A flat car specifically equipped with multi-level racks or decks for the loading and transporting of set-up vehicles, not suitable for other miscellaneous commodities.
FB 1/1917-1/1961 Flat car having skeleton superstructure, suitable for carrying barrels, known as "Barrel Rack Car".
FB 1/1973-4/1999 Bulkhead Flat Cars. Equipped with fixed or permanently attached movable bulkheads or ends a minimum of three feet in height and flat floor for general commodity loading.
FC 4/1938 A flat car specially equipped to carry containers, trucks or trailers, for the transportation of liquids or other commodities 
FC 1/1939-1/1961 A flat car or other type of car specifically equipped to carry trucks or trailers for the transportation of freight. 
FC 1/1962-1/1969 A flat car or other type of car specifically equipped to carry trucks, trailers, or removable trailer bodies for the transportation of freight. 
FD 4/1938-4/1999 Depressed Center Flat. A flat car of special construction having the portion of the floor extending between trucks depressed to provide necessary head room for certain commodities.
FG 1/1917-7/1932 Flat or gun truck car for special transportation of heavy ordnance. 
FG 4/1938-1/1969 Flat or gun truck car for special transportation of heavy ordnance or other heavy commodities.
FL 1/1917-4/1999 Flat logging car or logging truck. This is either an ordinary flat car, or car consisting of two trucks fitted with cross supports over truck bolsters; the trucks connected by a skeleton or flexible frame and logs loaded lengthwise on cross supports. 
FM 1/1917-4/1999 Ordinary flat car for general service. This car has flooring laid over sills and without sides or ends. 
FP 7/1932-4/1938 Flat Rack. An ordinary flat car provided with side and end racks, with door openings in sides. Suitable for handling pulpwood.
FT 4/1924-2/1928 Flat car. A car equipped with holders for the transportation of illuminating gas.
FW 1/1917-4/1999 Flat well-hole car for special transportation of plate-glass, etc. This car is a flat car with hole in middle to enable lading to be dropped down on account of clearance limits.
NOTE:
When cars are equipped with permanent racks for stowing parts, or are specially modified or equipped to provide for loading of a particular commodity, the letter "S" should be affixed to the applicable designating letters. A note should be included in The Official Railway Equipment Register to show the particular special equipment proposed for the car.this does not apply to "FA", "FC", "FD", "FL" or "FW" designations. (1/1949-4/1999)

 

Class "G"

Gondola Car Type

Code Used in ORER Description

GA 

1/1917-2/1926

Gondola Car. This car has sides and ends open at top, and drop bottom; suitable for general coal or ore trade, stone or general trade. 

3/1927-4/1999

An Open Top Car having fixed sides and ends and drop bottom, consisting of doors hinged crosswise of car to dump between rails.

GB

4/1924-4/1938

An Open Top Car, having fixed sides and ends and solid bottom, suitable for mill trade, but not having sufficient cubic capacity to carry its marked capacity of bituminous coal.

1/1939-4/1999

An Open Top Car, having fixed sides, fixed or drop ends and solid bottom, suitable for mill trade. (includes former "GK", "GKA", "GM" and "GMA")

GC 

1/1917-2/1926

Gondola Coke Car. Gondola car fitted with coke racks and having drop bottoms.

GD 

4/1924-2/1926

Gondola Car. A car open on top, having side dump arrangements, and having sufficient strength and cubic capacity to carry its marked capacity of bituminous coal. 

3/1927-4/1938

An Open Top Car, having fixed ends, solid bottom and sides equipped with doors for dumping and having sufficient cubic capacity to carry its marked capacity of bituminous coal.

1/1939-4/1999

An Open Top Car, having fixed or drop ends, solid bottom and sides equipped with doors for dumping. 

GDA 

3/1929-4/1938

An Open Top Car, having fixed ends, solid bottom and sides equipped with doors for dumping, but not having sufficient cubic capacity to carry its marked capacity of bituminous coal.

GE

1/1917-2/1926

Gondola car having drop bottoms and drop ends; suitable for general coal or ore or mill trade.

3/1927-1/1969

An Open Top Car, having fixed sides, drop ends and drop bottom, consisting of doors hinged crosswise of car to dump between rails.

GF 

1/1917-2/1926

Gondola Car. A car equipped with coke racks and having solid bottoms. 

GH 

3/1927-4/1999

An Open Top Car, having fixed sides, drop ends and drop bottom, consisting of doors hinged at center sills to dump outside of rails.

GK 

4/1924-4/1938

An Open Top Car, having fixed sides and ends and solid bottom, suitable for mill trade and having sufficient cubic capacity to carry its marked capacity of bituminous coal. (reclassified into "GB" )

GKA 

3/1929-4/1938

An Open Top Car, having fixed sides and ends and solid bottom, not suitable for mill trade and having sufficient cubic capacity to carry its marked capacity of bituminous coal. (reclassified into GB)

GM

4/1924-2/1926

Gondola Car. A car open on top, with solid bottoms, low sides and drop ends, to facilitate twin shipments, suitable for mill trade, but not having sufficient strength or cubic capacity to carry its marked capacity of bituminous coal. 

3/1927-4/1938

An Open Top Car, having low fixed sides and drop ends and solid bottom, suitable for mill trade, but not having sufficient cubic capacity to carry its marked capacity of bituminous coal. (reclassified into "GB")

GMA 

3/1929-4/1938

An Open Top Car, having low fixed sides and drop ends and solid bottom, suitable for mill trade, and having sufficient cubic capacity to carry its marked capacity of bituminous coal. (reclassified into "GB")

GP 

7/1932-4/1938

An Open Top Car with solid bottom and fixed sides and ends surmounted by racks, and provided with side door openings. Suitable for handling pulpwood. 

GR 

3/1929-4/1938

An Open Top Car, having fixed sides and ends and level bottom, with one or more hoppers dumping between rails, or between and outside of rails. (reclassified "HE")

GRA 

3/1929-1/1969

An Open Top Car, having fixed sides and ends and level bottom with one or more hoppers dumping outside of rails.

GS

1/1917-2/1926

Gondola Car. A car with fixed sides and ends, and flat bottom composed of dump doors hung at inside edge, and dumping to the side of track. 

3/1927-3/1929

An Open Top Car, having fixed sides and ends and drop bottom, consisting of doors hinged at center sills to dump outside of rails.

7/1932-1/1962

An Open Top Car, having fixed sides and ends and drop bottom, consisting of doors hinged at center sills or side sills to dump outside of rails.

10/1966-4/1999

An Open Top Car, having fixed sides and ends and drop bottom, consisting of doors hinged at center sills or side sills to dump outside and/or inside of rails.

GT 

4/1924-1/1969

An Open Top Car, having high fixed sides and ends and solid bottom, suitable for unloading coal on dumping machines only, but not suitable for mill trade.

GW 

7/1932-4/1999

An Open Top Well-Hole Car for transportation of special commodities. A solid bottom car with fixed sides and ends, having one or more openings or depressions provided in floor, permitting the lading to be lowered in order to obtain overhead clearance.

NOTES:

When gondola cars are equipped with any or all of the modifications as provided for in the following Notes 1, 2, and 3, the suffixes as provided for shall be added to the primary classification in the order of the notes as listed.

1) 

If any of these gondola cars are equipped with coke racks, the letter "C" should be affixed to the regular symbol to designate its special class of service. (3/1927-1/1980)

2) 

If any of these gondola cars are equipped with a roof or are covered for protection of contents the letter "R" should be affixed to the regular symbol to designate the special class of service. (3/1927-4/1999)

3)

Where cars are equipped with a permanent racks for stowing parts or are specially modified or equipped to provide for loading of a particular commodity, the letter "S" should be affixed to the applicable designating letters. (1/1949-4/1999)

 

Class "H"

Hopper Car Type

Code Used in ORER Description

HC 

1/1917-2/1926

Hopper car equipped with coke racks.

HD

1/1917-2/1926

Hopper car equipped with side dump hoppers.

3/1927-10/1928

An Open Top Car, having fixed sides and ends, and bottom consisting of hoppers dumping outside of rails and self-clearing.

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails. Doors each side of car arranged to operate in more than one unit.

1/1939-1/1969

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails. (includes former "HDA", reclassified into "HK")

HDA 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside of rails. Doors each side of car arranged to operate as a single unit. (reclassified into "HD")

HE 

3/1927-10/1928

An Open Top Car, having fixed sides and ends, and bottom consisting of hoppers dumping between rails and not self-clearing.

3/1929-1/1969

An Open Top Car, not self-clearing, having fixed sides and ends, level bottom with two or more divided hoppers with doors hinged crosswise of cars and dumping between rails. (includes former "GR")

HF 3/1927-10/1928

An Open Top Car, having fixed sides and ends; equipped with cross hoppers dumping between rails; also a side dump hopper extending from end of car to bolster, dumping outside of rail.

3/1929-1/1969

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged crosswise dumping between rails; also two divided hoppers extending from end of car to bolster, with doors hinged lengthwise of car and dumping outside of rails.

HFA 

 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of divided hoppers at center with doors hinged lengthwise, dumping outside and/or inside of rail; also one divided hopper, each end, extending from end of car to bolster with doors hinged lengthwise of car and dumping outside of rails. Center doors each side of car operate as a single unit.

1/1939-4/1999

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of divided hoppers at center with doors hinged lengthwise, dumping outside and/or inside of rail; also one divided hopper, each end, extending from end of car to bolster with doors hinged lengthwise of car and dumping outside of rails.

HFB 

7/1932-1/1969

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of one or more divided hoppers at center of car with doors hinged lengthwise dumping inside rail; also cross hoppers at ends with doors dumping between, or between and outside of rail.

HK 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside and/or inside of rails. Doors each side of car arranged to operate as a single unit.

1/1939-1/1969

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two or more divided hoppers with doors hinged lengthwise of car and dumping outside and/or inside of rails.

HM 

1/1917-2/1926

Hopper Car. Similar is general design to gondola car, having sides and bottom ends and open at top, equipped with hopper bottoms and self-cleaning.

3/1927-10/1928

An Open Top Car, having fixed sides and ends, and bottom consisting of double hoppers dumping between rails and self-clearing.

3/1929-4/1999

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two divided hoppers with doors hinged crosswise of car and dumping between rails.

HMA 

 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as more than one unit.

1/1939-4/1999

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. (includes former "HMB")

HMB 

3/1929-7/1943

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of two divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as a single unit. (reclassified "HMA")

HT 

1/1917-2/1926

Hopper. Twin Similar to ordinary hopper, only equipped with two or more hopper doors instead of one.

3/1927-10/1928

An Open Top Car, similar in construction to the "HM" car but having more than one set of double hoppers.

3/1929-4/1999

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged crosswise of car and dumping between rails.

HTA 

 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as more than one unit.

1/1939-4/1999

An Open Top Self-Clearing Car, having fixed sides and ends and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails. (includes former "HTB")

HTB 

3/1929-4/1938

An Open Top Self-Clearing Car, having fixed sides and ends, and bottom consisting of three or more divided hoppers with doors hinged lengthwise of car and dumping between rails. Doors each side of car arranged to operate as a single unit. (reclassified "HTA")

NOTES:

1)

If any of these hopper cars are equipped with coke racks, the letter "C" should be affixed to the regular symbol to designate its special class of service.3/1927-1/1980

2)

If any of these hopper cars are equipped with a roof or are covered for protection of contents the letter "R" should be affixed to the regular symbol to designate its special class of service.1/1917-4/1999

3)

Where cars are equipped with permanent racks for stowing parts or are specially modified or equipped to provide for loading of a particular commodity, the letter "S" should be affixed to the applicable designating letters. A note should be included in the Official Railway Equipment Register to show the particular special equipment proposed for the car.1/1949-4/1999

 

Class "L"

Special Car Type

Code Used in ORER Description

LB

4/1938-1/1969

A house car with high sliding doors at center, both sides. Balance of sides, approximately the lower half, provided each side with two or more doors hinged at top to open outward with suitable locks at bottom.

LC

1/1939-4/1999

A box car with side doors and roof hatches. May be equipped with end doors.

LF

1/1939-1/1941

A Flat car specially equipped to carry containers for the transportation of liquids or other commodities.

7/1943-1/1962

A flat car equipped to handle one or more demountable containers for the transportation of liquids or other commodities not under refrigeration.

10/1966-1/1969

A flat car equipped to handle one or more demountable containers for the transportation of commodities not under refrigeration (not applicable to flat cars designed to handle containers in TOFC/COFC service or containers handling setup vehicles)

LFA

7/1943-1/1969

A flat car equipped with a container or containers for the purpose of transporting commodities immersed in liquids or gases.

LFR

1/1962-1/1969

A flat car supplied with a power unit and equipped to handle one or more demountable containers for the transportation of commodities under refrigeration.

LG

1/1949-4/1999

An open top car equipped to handle one or more demountable containers for the transportation of commodities not under refrigeration.

LM

10/1966-4/1999

A car equipped with one or more permanently enclosed tanks or containers, provided with one or more openings for loading and equipped for pneumatic or gravity unloading. Car is suitable for handling certain dry powdered or granular commodities and also low viscosity, non-dangerous liquid commodities.

LO

3/1927-3/1929

A self-clearing permanently enclosed car, having roof, sides and ends, fitted with openings in roof for loading and having weather-tight covers, also opening in bottom for unloading, having tight fitting covers or doors to prevent leakage.

7/1932-7/1943

A self-clearing permanently enclosed car, with or without insulation, having fixed roof, sides, ends, and provided with openings for loading through roof or sides. Loading openings fitted with weather-tight covers or doors. Car also provided with bottom openings for unloading, with tight fitting covers or doors to prevent leakage of such commodities as sand, etc..

1/1949-1/1961

A self-clearing permanently enclosed car, with or without insulation, having fixed roof, sides, ends, and provided with openings for loading through roof or sides. Loading openings fitted with weather-tight covers or doors. Car may also be provided with bottom openings for unloading, with tight fitting covers, doors or valves or may be provided with facilities for discharge of lading through openings in roof or sides. Cars may have one or more compartments.

10/1966-4/1999

A permanently enclosed car, other than a house car, regardless of exterior or interior shape, for handling dry powdered or granular commodities, with or without insulation and provided with openings for loading through top or sides with weather-tight covers or doors. Car may be provided with one or more bottom openings for unloading, with tight fitting covers, doors, valves, or tight fitting slide or gate to prevent leakage of lading. Car may be provided with facilities for discharge of lading through openings in top or sides and may have one or more compartments. Mechanical or other means may be provided within car to expedite loading or unloading.

LP

 

7/1932-4/1938

An Open Top Car having solid bottom and fixed sides and ends. (either slatted or solid) and provided with side door openings. With or without running boards having guard rails. Suitable for handling pulpwood.

1/1939-1/1969

An Open Top Car, having solid bottom and fixed ends with or without fixed sides (either slatted or solid). Also with or without running boards having guard rails. Suitable for handling pulpwood.

LPA

4/1938

In general similar to a flat car, but provided with fixed ends. Suitable for handling pulpwood.

LRC

 

4/1938-7/1943

A house car with or without ventilation, heavily insulated at floor. Sides and ends heavily insulated either full height or to height approximately of maximum load, with insulated cross partitions forming compartments. With or without blankets of suitable insulating material placed over top of load in each compartment. With or without gravity conveyors for loading and unloading. Designed primarily for the transportation of Solid Carbon Dioxide.

1/1949-1/1973

A house car, heavily insulated; with or without ventilation, with or without hatches, with or without gravity conveyors for loading and unloading. May have cross partitions forming compartments. Designed primarily for the transportation of Solid Carbon Dioxide.

LS

 

4/1938-1/1939

A heavily insulated, self-clearing, permanently enclosed car, having fixed roof, sides and ends, and provided with openings for loading through roof and outlets at bottom for unloading. Top openings fitted with weather-tight covers and bottom outlets with leak-proof valves. Designed primarily for bulk sugar transportation.

1/1962-4/1999

A car of special construction having two separate interlocking units which form a car body. Units may be separated and load interposed between and locked in place to form a complete transportation unit.

LT

4/1938-10/1957

A permanently enclosed car having a cylindrical body for handling certain dry powdered or granular commodities, provided with top opening for loading, fitted with weather-tight covers or doors. One or more bottom openings provided for unloading, with tight fitting slide or gate to prevent leakage of lading. Inside of body provided with mechanical means to expedite unloading.

LTA

4/1938-10/1957

A permanently enclosed car having a cylindrical body for handling certain dry powdered or granular commodities, provided with top opening for loading, fitted with weather-tight covers or doors. One or more bottom openings provided for unloading, with tight fitting slide or gate to prevent leakage of lading.

LU

10/1966-4/1999

An enclosed car with roof, having a special metal beam of heavy design at top of each side to support a series of retractable overhead side doors and the appurtenances, or other types of doors, running substantially the length of car, which beams also support the roof details. Car may be equipped with special loading devices or racks for handling various commodities.

 

Class "M"

General Service Maintenance of Way Equipment Cars

Code Used in ORER Description

MWB

1/1953-4/1999

Ballast Cars. All descriptions of cars used for the purpose of carrying ballast for the laying of new right of way and repairs. The car used generally for this type of work is of the gondola type, with side or center dump.

MWC

1/1953-7/1984

Caboose and Tool Car. Similar to Tool Car, but having one end fitted up as a caboose, with bunks, stove and water storage, with or without lookout, and is used in either work or wrecking trains.

MWD

1/1953-4/1999

Dump Cars. On the type of contractors' car used for building up fills; the body of the car dumps being raised by means of counterweight, air or hand power.

MWE

1/1953-4/1999

Ballast Spreader and Trimmer. A car with blades or wings for spreading or trimming ballast.

MWF

1/1953-4/1999

Flat Car. Used for transporting rails, ties or ballast and for storage of wrecking trucks, or gathering scraps along right of way. These cars are at times equipped with low sides, about 10 or 12 inches high.

MWG

1/1953-4/1999

Section Gang or Track Inspection Car. Flat car, with or without seats or tool boxes, and equipped with single or double cylinder gasoline engine serving as motive power.

MWH

1/1953-4/1999

Hand Car. This car is flat and mounted on four wheels and propelled by means of pushing, known as "Push Car".

MWJ

1/1953-4/1999

Ballast Unloader. A car equipped with machinery for pulling a plow through cars loaded with ballast.

MWK

1/1953-4/1999

Snow-Removing Car. A car equipped with any special device for removing snow from between or alongside of rails.

MWL

1/1953-4/1999

Hand Car. This is a small flat car, with or without seats, mounted on four wheels and propelled by means of cranks or hand levers.

MWM

1/1953-4/1999

Store-Supply Car. A car equipped for handling material to be distributed for railway use.

MWP

1/1953-4/1999

Pile Driver. A car equipped with machinery for pile driving.

MWS

1/1953-4/1999

Steam Shovel. Car equipped with donkey engine housed in. Having a boom of wood or steel and the end of which is a shovel or scoop. It may be propelled by its own power or by means of a locomotive and run as a car in freight trains, being equipped with safety appliances. The cubic capacity of shovels, in yards, can be indicated by figures after the classification letters.

MWT

1/1953-4/1999

Tool and Block Car. A car used for the carrying all descriptions of tool equipment and blocking. This car has side and end housings and roof, also end platforms. There are doors in sides and ends and usually windows. It is fitted inside with proper racks and boxes for storage of tools.

MWU

1/1953-4/1999

Wrecking Derrick. This derrick has boom and hoist fitted to frame of flat car and lifting done by means of hand power; propelled by locomotives.

MWV

1/1953-4/1999

Wrecking Derrick. This derrick has boom and hoist fitted to flat car and having drum at one end to furnish means of hoisting; steam furnished to donkey engine, running drum, by means of flexible steam line from attached locomotive; propelled by locomotive.

MWW

1/1953-4/1999

Wrecking Derrick. A derrick used for wrecking purposes having donkey engine to raise and lower booms and hoists; engine housed in and on separate platform with boom, is pivoted in center of car frame in order that it can be worked on either side or ends; usually fitted with anchor beams to be used for heavy lifting. Fitted with safety appliances and propelled by means of locomotive. Lifting capacity in tons shown by means of figures.

MWX

1/1953-4/1999

Boarding Outfit Car. This includes cars used for boarding, sleeping or cooking purposes in construction and similar work.

Weed Exterminator

1/1953-4/1999 A car equipped with machinery for propelling itself, or otherwise, and burning or spraying weeds along the track as it proceeds.
Grass Cutter 1/1953-4/1999 A car equipped with machinery for propelling itself, or otherwise, and cutting grass along the track as it proceeds.

Ditching Car

1/1953-4/1999 A car equipped with machinery for propelling itself, or otherwise, and excavating ditches along the sides of the track as it proceeds.

Rail Saw

1/1953-4/1999 A car equipped with machinery for sawing track rails and similar material.

Rail Bender

1/1953-4/1999 A car equipped with machinery for bending track rails and similar material.

Track Layer

1/1953-4/1999 A car equipped with machinery for propelling itself, or otherwise, and laying the track ahead of it as it proceeds.

 

Class "N"

Caboose

Code Used in ORER Description

NE

1/1917-10/1969

Caboose mounted on eight wheels and longer than four-wheel caboose, but of the same general design.

NM

1/1917-10/1969

Freight train service caboose for convenience of trainmen. This caboose is mounted on four wheels and has lookout at top over roof. It is fitted with bunks or benches and a stove for cooking and heating purposes, also tank for storage of drinking and washing water, and small tool storage boxes.

 

Class "R"

Refrigerator Car Type

Code Used in ORER Description

RA

4/1924

Meat and Produce Refrigerator. A car with body, doors and hatch plugs, equipped with insulation and brine ice tanks, and without ventilating devices.

1/1917 & 9/1925-3/1929

Meat and Provision Refrigerator. A car with body, doors and hatch plugs, equipped with insulation and brine ice tanks and without ventilating devices.

7/1932-1/1980

Brine-Tank Refrigerator. A house car equipped with insulation and brine-tanks. Designed primarily for the combined use of crushed ice and salt and usually without ventilating devices. Used chiefly for meats and packing-house products.

RAM

7/1943-1/1980

Brine-Tank Refrigerator, similar to "RA" but equipped with beef rails.

RB

1/1917-2/1926

Beer and Ice Refrigerator. A car with body and doors equipped with insulation, having no ice tanks or ventilating devices.

3/1927-3/1929

Beer, Ice, Water, Vinegar or Produce Refrigerator. A car with body and doors equipped with insulation and of the same general construction as the standard refrigerator car with the exception that the car is not equipped with ice tanks or ventilating devices.

7/1932-4/1958

Beverage, Ice, Water or Vinegar Refrigerator, similar in design to a bunker refrigerator, except that it is not equipped with ice bunkers and with or without ventilating devices.

10/1966-1/1980

A bunkerless refrigerator car similar in design to an "RS" car with or without ventilating devices and with or without devices for attaching portable heaters. Constructed with a minimum of 3 in. of insulation in sides and ends and 3-1/192 in. in floor and roof based on the insulation requirements given in A.A.R. Supplement to Manual Plate C-2 or a thickness reduced in proportion to the thermal conductivity of the insulation.

RBL

10/1957-4/1999 

A car similar in construction to an "RB" type car, but equipped in addition with adjustable loading or stowing devices. 

NOTE: Cars equipped with interior side rails only, built new, rebuilt or reclassified on and after January 1, 1966, in order to qualify for the "RBL" designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car, plus facilities in doorway to accommodate doorway members. The facilities in the doorway are not required in cars equipped with plug type doors (1/1962-4/1999)

RBT

4/1938-1/1939

Beverage Container Refrigerator. Similar in design to "RS" type, but with no ice bunkers. Provided with two or more fixed tanks for transporting beverages or other liquids in bulk. With or without means of ventilation.

RC

7/1943

A car equipped with one or more demountable insulated containers. The containers may be equipped with facilities for refrigeration.

RCD

4/1938-1/1969

Solid Carbon Dioxide Refrigerator. A house car equipped with insulation, with or without means of ventilation and provided with a system of refrigeration in which Solid Carbon Dioxide is employed as the primary refrigerant.

RM

 

1/1917-3/1929

Refrigerator or Produce Car. A car suitable for carrying commodities that need icing in transit. This car is equipped with two or more ice bunkers, or baskets, and suitable means for draining off melted ice or briny water. This car has body, door and hatch plugs equipped with insulation, with trap door in the roof for admission of ice and salt; also water seals inside of car.

4/1938-1/1939

Beef Rail Refrigerator. A fully insulated house car equipped with either brine tanks or ice bunkers. Designed primarily for the use of combined crushed ice and salt and with or without means of ventilation. Equipped with beef rails and used chiefly for fresh meat and packing house products.

RP

 

7/1932

Iceless Refrigerator. A house car equipped with insulation, with or without means of ventilation and provided with apparatus or other device for furnishing protection against heat and/or cold.

4/1938-4/1999

Mechanical Refrigerator car equipped with insulation, with or without means of ventilation and provided with apparatus or other device for furnishing protection against heat and/or cold. Apparatus operated by power other than through the car axle.

RPA

4/1938-10/1957

Mechanical Refrigerator. A house car equipped with insulation, with or without means of ventilation and provided with apparatus or other device for furnishing protection against heat and/or cold. Apparatus operated by direct mechanical drive from car axle.

RPB

4/1938-10/1957

Mechanical Refrigerator. A house car equipped with insulation, with or without means of ventilation and provided with apparatus or other device for furnishing protection against heat and/or cold. Apparatus operated by electro-mechanical drive from car axle.

RPL

1/1962-4/1999

Mechanical Refrigerator. Similar to "RP" but equipped in addition with adjustable loading or stowing device.

RPM

1/1956-1/1980

Mechanical Refrigerator. Similar to "RP" but equipped with beef rails.

RS

1/1917-3/1929

Standard Refrigerator. A car with body, doors and hatch plugs, equipped with insulation, with ice tanks and either with or without ventilating devices.

7/1932

Bunker Refrigerator. A house car equipped with insulation and ice bunkers. Designed primarily for use of chunk ice and with means for ventilation.

4/1938-1/1995

Bunker Refrigerator car equipped with ice bunkers. Designed primarily for use of chunk ice and with or without means of ventilation.

RSB

10/1966-1/1980

Bunker Refrigerator. A fully insulated house car equipped with ice bunkers and air circulating fans. Designed primarily for use in bulk potato or similar type loading as cars are equipped with interior slope sheets and conveyors and/or equipment for mechanical loading and unloading.

RSM

7/1943-1/1980

Bunker Refrigerator. Similar to "RS" but equipped with beef rails.

RSTC

1/1962-1/1980

Bunker Refrigerator. A fully insulated house car equipped with one or two ice bunkers or brine tanks, with or without means for exterior ventilation, equipped with thermostatically controlled electric fan forced air circulating system, powered by equipment located on car.

RSTM

10/1966

Bunker Refrigerator. Similar to "RSTC", but equipped with beef rails.

RT

3/1928-7/1943

Milk Refrigerator. A car designed for transporting milk in bulk under refrigeration.

NOTE:

Cars having special heating equipment for the protection of commodities against freezing to be covered by affixing the letter "H" to the designating symbol (4/1938-10/1966).

 

Class "S"

Stock Car Type

Code Used in ORER Description

SA

1/1953-1/1969

Stock Car. A car for transportation of stock on the hoof (except horses and mules), equipped with roof, slatted sides and side doors, and fixed deck located sufficiently high to permit the loading of cattle on the lower deck. With or without feed and water troughs.

SC

4/1924-1/1969

Stock Car. This car is for the transportation of stock on the hoof, and is equipped with roof, slatted sides and side doors, and convertible single or double deck. With or without feed and water troughs.

SD

1/1917-1/1969

Stock Car. Composite having drop doors in floor and means of housing in sides and making drop-bottom box car.

SF

4/1924-1/1969

Stock Car. This car is for transportation of stock on the hoof, and is equipped with roof, slatted sides and side doors, and fixed double deck. With or without feed and water troughs.

SH

4/1924-1/1969

Horse Car. A car specially fitted for the transportation of horses in freight service.

SM

1/1917-7/1984

Stock Car. This car is for transportation of stock on the hoof, and is equipped with roof, slatted sides and side doors, and single deck. With or without feed and water troughs.

SP

1/1917-1/1969

Stock Car. Used in poultry trade, fitted with roof and sides usually of wire netting, fitted with shelves for storing crates of poultry and leaving space for poultrymen, feed bag and watering facilities.

SPR

7/1932-7/1943

Stock-Refrigerator. A combination poultry and refrigerator car, one end to accommodate live poultry and the other end suitable for dressed poultry, butter, eggs, etc., requiring refrigeration.

ST

10/1966-7/1984

Stock Car. This car is for transportation of livestock on the hoof, and is equipped with roof, slatted sides and side doors, and fixed triple deck. With or without feed and water troughs.

 

Class "T"

Tank Car Type

Code Used in ORER Description

TA

1/1917-7/1932

Acid Tank. Of same general construction as oil tanks.

4/1938-1/1939

Tank car for acid service. Of same general design and construction as oil tanks except tank is equipped with safety vents and bottom discharge outlet is prohibited necessitating unloading by means of a syphon pipe.

7/1943

Tank car for acid service. Of same general design and construction as oil tanks except same must be equipped with safety vents and overhead loading arrangement. Safety valves and bottom discharge are prohibited.

1/1953

Tank car equipped with container of ICC Specification 103-A, 103-AW, 103-C and 103-CW. Also ARA-II, ARA-III or ICC-103 if containers and appurtenances were originally designed or subsequently reconstructed to comply with the requirements for ICC-103-A cars.

10/1957

Tank car equipped with container of ICC Specification 103A, 103A-W, 103E-W, 103A-N-W, 103C, 103C-W. Also ARA-II, ARA-III, ICC-103, ICC-103-W if containers and appurtenances were originally designed or subsequently reconstructed to comply with the requirements for ICC-103A cars.

10/1966-1/1969

Tank car equipped with container of ICC Specification 103A, 103A-W, 103E-W, 103A-N-W, 103C, 103C-W, and 111A100-W-6. Also ARA-II, ARA-III, ICC-103, ICC-103-W or ICC-111A100-W-2 if containers and appurtenances were originally designed or subsequently reconstructed to comply with the requirements for ICC-103A cars.

TG

1/1917-7/1943

Tank car having glass or glass-lined tanks, for use in hauling mineral waters and other special products.

1/1953

Tank car having one or more glass-lined containers.

10/1957-1/1969

Tank car having one or more glass-lined containers of ICC Specification 103A-W.

TGB

 

4/1938-1/1941

A car equipped with two cylindrical insulated metal tanks, with or without special interior lining, with cab located between tanks for protecting loading and unloading devices of each tank. Car suitable for transportation of beverages, etc., in bulk.

7/1943

Tank car for transporting beverages, etc., having two cylindrical metal tanks (with or without lining), the loading and unloading devices for same being enclosed within, and protected by a cab located between the tanks.

THI

10/1966-1/1969

Insulated tank car equipped with heater device which permits intransit heating of lading. Apparatus operated by power other than through the axle.

TL

4/1924-7/1932

Acid Tank. Of same general construction as oil tank, but having lead lining.

4/1938-1/1941

Tank car with special lining. Of same general construction as acid tanks but equipped with special lining of tin, zinc, aluminum, nickel or rubber, etc., (except glass) capable of resisting corrosive action of the lading or to prevent contamination of the lading.

7/1943

Tank car of same general construction as "TA" car except that tank is lined with aluminum, nickel, rubber, tin, zinc, etc., (except glass) to resist corrosive action of lading or to prevent its contamination.

1/1953

Tank car equipped with container lined with any material other than glass.

10/1957

Tank car equipped with container lined with any material other than glass, such as ICC Specification 103B, 103B-W, ICC-103B100-W, 105A300-W (rubber-lined). Also ARA-III (rubber-lined).

10/1966-1/1969

Tank car equipped with container lined with any material other than glass, such as ICC Specification 103B, 103B-W, 103B100-W, 111A100-W-5, 105A300-W (rubber-lined). Also ARA-III (rubber-lined).

TM

1/1917-7/1932

Tank car for general service. This car is for general oil or liquid service, and consists of a steel tank mounted on frame or mounted directly on cradles over truck bolsters. It is equipped with one or two safety release valves, and is emptied by valves or valve at bottom. At the top is a dome, with or without manholes, and openings through which the tank may be filled.

4/1938-1/1941

Tank car for general oil or liquid service. These are uninsulated and unlined cars, the design of tank and appurtenances being dependent upon the classification of the lading to be transported. Car consists of a riveted, fusion or forge welded tank mounted on underframe or mounted directly on cradles over truck bolsters. It is required to be equipped with safety valves or safety vents depending upon the lading transported. It is generally equipped with bottom discharge outlet with valve for bottom unloading. This is sometimes omitted when unloading is by means of a syphon pipe.

7/1943

Tank car for transporting oil, gasoline, or other liquids, including liquefied compressed gases, but not including acids. Consists of a riveted, fusion welded or forge welded tank car mounted on car structure. Design of tank and appurtenances for these cars is dependent upon the lading to be transported. Tanks must be equipped with safety valves or safety vents. Unloading may be through bottom discharge charge or, if not so equipped, overhead.

1/1953

Tank car equipped with container of ARA or AAR Specification I, II, III, III Experimental Welded Seams, IV, 203, 203-W, 203-X, or ICC Specification 103, 103-W, 104, 104-W or Specification EMERGENCY USG-A, USG-B or USG-C.

10/1957

Tank car equipped with container of ARA or AAR Specification I, II, III, III Experimental Welded Seams, IV, 203, 203-W, 203-X, or ICC Specification 103, 103-W, 103D-W, 104, 104-W or Specification EMERGENCY USG-A, USG-B or USG-C.

10/1966-1/1969

Tank car equipped with container of ARA or AAR Specification I, II, III, III Experimental Welded Seams, IV, 203, 203-W, 203-X, or ICC Specification 103, 103-W, 103D-W, 104, 104-W, ICC-111A100-W-1, ICC-111A100-W-3 or Specification EMERGENCY USG-A, USG-B or USG-C.

TMI

 

4/1924-7/1932

Tank car insulated for handling casing head gasoline, etc.

4/1938-1/1939

Car with insulated tank. Of same general design and construction as oil tanks, except tank is insulated to minimize temperature change of the lading.

TMN

4/1938-1/1941

A car of special design with attachments to carry containers for the transportation of non-regulatory commodities.

7/1943

A car of suitable design for transporting removable non-dangerous articles containers.

TMU

3/1928-7/1932

A car equipped with holders, other than glass lined, for the transportation of gas and liquids.

4/1938-1/1941

A car designed with cradles to carry containers for the transportation of compressed or liquified gases, or other commodities authorized to be transported in I.C.C.-106-A containers.

7/1943

A car of suitable design, including cradles and anchorage, for use in transporting liquefied compressed gas ton containers of Class I.C.C.-106-A series and cars of I.C.C.-107-A series for transporting compressed gases.

1/1953

Tank car equipped with containers of ARA Specification VI, B, E, Specification 27, ICC Specification 27, 106A500, 106A800 or 107A **** series.

10/1957

Tank car equipped with containers of ARA Specification VI, B, E, Specification 27, ICC Specification 27, 51, 106A500, 106A500-X, 106A800, 106A800-X, 106A800-NCI, 107A **** series or 110A500-W.

10/1966-1/1969

Tank car equipped with containers of ARA Specification VI, B, E, Specification 27, ICC Specification 27, 51, 106A500, 106A500-X, 106A800, 106A800-X, 106A800-NCI, 107A **** series 110A500-W, or 110A800-W.

TP

1/1953

Tank car equipped with container of ARA Specification IV, IV-A, V or ICC Specification 104, 104A, 104A-W, 105, 105A300, 105A300-W, 105A400, 105A400-W, 105A500, 105A500-W, 105A600 or 105A600-W.

10/1957

Tank car equipped with container of ARA Specification IV-A, V or AAR-205A300-W or ICC Specification 104A, 104A-W, 105, 105A100, 105A100-W, 105A300, 105A300-W, 105A400, 105A400-W, 105A500, 105A500-W, 105A600, 105A600-W or 109A300-W.

10/1966-1/1969

Tank car equipped with container of ARA Specification IV-A, V or AAR-205A300-W or ICC Specification 104A, 104A-W, 105, 105A100, 105A100-W, 105A200-W, 105A300, 105A300-W, 105A400, 105A400-W, 105A500, 105A500-W, 105A600, 105A600-W, 109A300-W, 111A100-W-4, 112A400-W or 112A500-W.

TPA

10/1957

Tank car equipped with aluminum container of ICC Specification 104A-AL-W, 105A100AL-W, 105A300AL-W or 109A100AL-W.

10/1966-1/1969

Tank car equipped with aluminum container of ICC Specification 104A-AL-W, 105A100AL-W, 105A200AL-W, 105A300AL-W, 109A100AL-W, 109A200-AL-W or 109A300AL-W.

TR

1/1953

Tank car equipped with container of AAR Specification 201A35, 201A35 SPECIAL, 201A35-W, 201A35-X or ICC Specification 103-AL and 103C-AL.

10/1957

Tank car equipped with container of AAR Specification 201A35, 201A35 SPECIAL, 201A35-W, 201A35-X, 201A70-W or ICC Specification 103AL, 103AL-W, 103A-AL-W and 103C-AL.

10/1966-1/1969

Tank car equipped with container of AAR Specification 201A35, 201A35 SPECIAL, 201A35-W, 201A35-X, 201A70-W or ICC Specification 103AL, 103AL-W, 103A-AL-W, 103C-AL and 111A60AL-W.

TS

1/1917-2/1928

Tanks for special commercial service.

TVI

10/1966-1/1969

Tank car equipped with insulated container having an inner and outer shell with a vacuum in the annular space to AAR Specification 204-W.

TW

1/1917-2/1928

Tank car having wooden tank, instead of steel, and used for water, pickles, etc.

3/1928-7/1932

A car equipped for the transportation of pickles in brine.

4/1938-1/1939

A car equipped with one or more lined or unlined wooden tanks or tubs.

1/1941-7/1943

A car equipped with one or more wooden tanks, or, one or more metal or wooden tubs. Such tanks or tubs may be lined. Car is sometimes equipped with a roof.

1/1953

Tank car equipped with one or more wooden containers.

10/1957-1/1969

Tank car equipped with one or more wooden containers of ICC Specification 108 or 108A.

NOTE:

Where tanks, tubs or containers mounted on any of the preceding Tank Car Type Classes are insulated, the letter "I" should be affixed to their applicable designating letters (7/1943-1/1969).

 

Class "V"

Ventilator Car Type

Code Used in ORER Description

VA

 

1/1917-3/1929

Vegetable Ventilator. A car equipped with insulation, but having common box car end and side doors which afford no protection against heat or cold.

7/1932-1/1969

Fruit-Vegetable Ventilated Box. Similar in design to general service box car, but with either end and/or side ventilators, and with or without double sliding side doors. When equipped with double doors, one door is solid and the other screened.

VM

7/1932-1/1969

Fruit-Vegetable Ventilator. Similar in design to ventilated box car, except that it is partially insulated.

VS

 

1/1917-3/1929

Standard Ventilator. A car equipped with insulation, including insulated side, end and top openings, and ventilating devices without ice tanks.

7/1932-1/1969

Fruit-Vegetable Insulated Ventilator. A house car equipped with insulation and hinged swinging side doors and means of ventilation. Not equipped for refrigeration, although sometimes provided with shallow boxes under hatches (or ventilating openings) to protect lading, but not to contain ice. Sometimes called "Produce Car".

NOTE:

Cars having special heating equipment for the protection of commodities against freezing to be covered by affixing the letter "H" to the designating symbol (3/1928-1/1980).

 

Class "X"

Box Car Type

Code Used in ORER Description

XA

 

1/1917-7/1932

Automobile. Similar in design to general service box car, but with exceptionally large side or side and end doors.

4/1938-7/1943

Automobile. Similar in design to general service box car, having 10 ft. or greater clear height inside but with side doors at least 10 ft. wide, with or without end doors.

XAB

4/1938-7/1943

Automobile. Similar in design to general service box car, less than 10 ft. clear height inside, but with side doors at least 10 ft. wide, with or without end doors.

XAF

7/1932-10/1966

Automobile-Furniture. Similar in design to automobile car, but usually of larger cubic capacity and greater inside clear height.

XAP

 

4/1938-1/1949

Automobile Parts. Similar in design to "XM", "XA" or "XAB" car, but equipped with special permanent racks or devices for stowing automobile parts.

1/1953-10/1966

Automobile parts. A house car similar in design to "XM" but specially equipped with permanent interior fixtures for stowing automobile parts, not suitable for general service loading of other miscellaneous commodities.

XAR

 

4/1938-1/1949

Automobile. Similar in design to general service box car, but with side doors at least 10 ft. wide, with or without end doors, and equipped with permanent automobile stowing equipment.

1/1953-10/1966

Automobile device. A house car similar in design to "XM" box except unlined with side or side and end doors and equipped with loading racks and/or floor tubes with tie-down chains for loading setup automobiles and trucks, not suitable for general service loading of all miscellaneous commodities.

NOTE: It is recommended that in each case where loading racks in "XAR" and "XMR" cars have been made inoperative by securing in roof of cars for the purpose of transferring cars to general service loading, a note to be included in the Official Railway Equipment Register showing series or individual numbers of cars affected.

XC

1/1968-1/1969

A house car having individual compartments with a multiplicity of side doors and suitable for general commodity loading.

XF

1/1917-10/1966

Furniture. Similar in design to general service box car, but usually with greater cubic capacity.

XI

1/1917-3/1929

Box Car, insulated. A box car having walls, floor and roof insulated, not equipped with ice bunkers or ice baskets. This car ordinarily used in transporting vegetables, fruits, etc.

7/1932-1/1961

Insulated Box. Similar in design to general service box car, but either wholly or partially insulated. Not equipped either with ventilating devices or for refrigeration.

10/1957-10/1966

Insulated box car similar in design to "XM", but either wholly or partially insulated, equipped either with or without ventilating devices, not equipped for refrigeration.

XL

1/1968-1/1969

Loader Equipped. A house car similar in design to "XM", either fully or partially lined with steel perforated side walls or equipped with interior side rails or stanchions and crossbar members, for securement of certain types of lading and/or permanently attached movable bulkheads.

NOTE: Cars equipped with interior side rails only, built new, rebuilt or reclassified on or after January 1, 1966, in order to qualify for the "XL" designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car, plus facilities in doorway to accommodate doorway members. The facilities in the doorway are not required in cars equipped with plug type doors.

XM

 

1/1917-3/1929

Box Car. General service, suitable for lading which should be kept from the weather. A box car is a closed car having side and end housings and roof, with doors in sides or sides and ends.

7/1932-4/1999

Box. A house car for general service and especially for lading requiring protection from the weather and equipped with side or side and end doors.

XMC

10/1957-10/1966

A house car having individual compartments with a multiplicity of side doors and suitable for general commodity loading. 

NOTE: When "XMC" cars are insulated, they shall be designated "XMCI".

XME

1/1953-10/1966

Merchandise loading. A house car similar in design to "XM" with wooden lining and fitted with interior stowing fixtures, but which notwithstanding such stowing fixtures can be used for general service loading. 

NOTE: When "XME" cars are insulated, they shall be designated class "XMEI".

XML

1/1953-10/1966

Loader Equipped. A house car similar in design to "XM", either fully or partially lined with steel perforated side walls or equipped with interior side rails or stanchions and crossbar members for securement of certain types of lading and/or permanently attached movable bulkheads (when "XML" cars are insulated, they shall be designated class "XMLI").

NOTE: Cars equipped with interior side rails only, built new, rebuilt or reclassified on and after January 1, 1966, in order to qualify for the "XML" designation, shall have a minimum of four (4) usable side rails on each wall of car, each extending from doorway to approximately four (4) feet from end of car, plus facilities in doorway to accommodate doorway members. The facilities in the doorway are not required in cars equipped with plug type doors (10/1966).

XMP

1/1949-10/1966

A house car similar in design to "XM" but specially equipped for specific commodity loading other than automobiles and parts and not suitable for miscellaneous commodity loading.

NOTE: It is recommended that in each case where the designation "XMP" is used, a note be included in the Official Railway Equipment Register to show the particular kind of loading for which cars are equipped.

XMR

1/1949-10/1966

Automobile Device. A house car similar in design to "XM", fully lined with side or side and end doors, equipped with loading racks and/or floor tubes with tie-down chains for loading setup automobiles and trucks and suitable for general service loading of other miscellaneous commodities.

NOTE: It is recommended that in each case where loading racks in "XAR" and "XMR" cars have been made inoperative by securing in roof of cars for the purpose of transferring cars to general service loading, a note be included in the Official Railway Equipment Register showing series or individual numbers of cars affected.

XP

1/1968-1/1973

Boxcar similar in design to "XM", but which is specially equipped for a specific commodity loading and not suitable for miscellaneous commodity loading. A brief description and the particular kind of lading for which intended must be included as a note in The Official Railway Equipment Register.

NOTE: It is recommended that when "XP" is used, a note be included in The Official Railway Equipment Register to briefly describe special equipment and the particular kind of loading for which intended (1/1969).

XR

1/1968-1/1969

Auto Device Car. A house car similar in design to "XM" box either lined or unlined, with side or side and end doors and equipped with loading racks and/or floor tubes with tie-down chains for loading setup automobiles and trucks.

NOTE: It is recommended that when loading racks in "XR" cars have been secured in roof of cars for purpose of transferring cars to general service loading, a note be included in the Official Railway Equipment Register showing series or individual numbers of cars affected and whether such cars are lined or unlined.

XT

 

1/1917-1/1939

Tank Box. A house car with or without doors, either metal lined or enclosing one or more tanks, to hold water or other liquids.

1/1941-4/1999

A house car with or without doors, with or without insulation, either metal lined or enclosing one or more tanks.

XU

1/1956-10/1966

A house car with removable superstructure to be used for Special Loading.

XV

1/1917-3/1929

Box Car, Ventilated. Similar to ordinary box, only having ventilation, and suitable for the transportation of produce or other foodstuffs not needing refrigeration.

NOTE:

1)

When any of the foregoing Class "X" cars are insulated, the letter "I" should be added to the designation (1/1968-4/1999).

2)

Cars having special heating equipment for the protection of commodities against freezing to be covered by affixing the letter "H" to the designating symbol (3/1928-1/1980).

3)

Boxcars dedicated to the transportation of commodities in Paragraph A, Rule 97, AAR Interchange Rules, must be designated "XP".

 

Source: Ian Cranstone's website: Canadian Freight Cars