Annual Tank Car Facility Survey


Tank Car Specifications & Terms


DOT-117 or 117R specifications: A non-pressurized tank car with a shell thickness of 9/16 of an inch and insulating material providing thermal protection. The tank cars have protected top fittings, a fully protected head shield, and a bottom outlet valve with an enhanced handle designed to prevent the tank car from emptying its contents in an incident. All the enhancements are designed to protect the tank from being punctured and to prevent the valves from being disrupted. DOT-117R tank cars are cars that have been retrofitted to meet the 117 specifications, to include a jacket and head shield.


DOT-117: These tank cars can be an 117A, 117J, or 117P specification.


CPC-1232: Industry-sponsored specification, intended to be safer than DOT-111 tank cars for carrying petroleum crude oil and ethanol. Cars ordered after October 2011 were required to meet this specification. These tank cars include a pressure relief valve, more extensive top fittings than on the DOT-111 rail tank cars, and a full height or half-height head shield. The shell of non-jacketed tank cars must be ½ inch thick, and for jacketed tank cars must be 7/16 inch thick.


DOT-111: A non-pressurized tank car with a thinner shell (7/16 of an inch) than is now required for the DOT-117 tank cars. These tank cars can carry both hazardous and non-hazardous liquids. These cars are not required to have head shields to protect the tank car from an adjacent car in an incident. The fittings and valves are not protected and are vulnerable to being sheared off in an incident leading to a release of contents. These tank cars also do not have a pressure relief device sized to protect against rupture in the event of a large fire.


DOT-105: A pressurized tank car that has additional safety features than what is required on DOT-111 class non-pressurized tank cars.


DOT-112: A pressurized tank car that has additional safety features than what is required on DOT-111 class non-pressurized tank cars.


DOT-114: A pressurized tank car that has additional safety features than what is required on DOT-111 class non-pressurized tank cars. There are very few of these cars actively operating in the fleet carrying Class 3 flammable liquids.


DOT-115: A non-pressurized tank car that is similar to the DOT-111 but includes an inner container surrounded by an outer shell. The inner container may be split into multiple compartments. There are very few of these tank cars actively operating in the fleet carrying Class 3 flammable liquids.


DOT-120: A pressurized tank car that has additional safety features than what is required on non-pressurized tank cars. There are very few of these tank cars actively operating in the fleet carrying Class 3 flammable liquids.


DOT-211: A non-pressurized tank car which is similar to the DOT-111 rail tank cars. There are very few of these tank cars actively operating in the fleet carrying Class 3 flammable liquids.


Other, Please Specify: If this facility is working on a tank car not otherwise listed, as being built or retrofit to the 117 or 117R specification, please list it in the box below and include the estimated number approved and projected.


Retrofit: DOT-117R tank cars are other tank cars that have been enhanced to meet the 117 specifications, to include a jacket, pressure relief devices, and head shield.


Annual Tank Car Facility Survey
Bureau of Transportation Statistics
1200 New Jersey Ave SE
Washington, DC 20590
TankCarSurvey@dot.gov
Phone: 800-853-1351


Business Hours:
9:00am-5:00pm ET, M-F


Frequently Asked Questions