DOT-117 tank car

The DOT-117 (TC-117 in Canada) is a type of unpressurized tank car in use on North American railroads.

[1] The specifications require that the tank shells be constructed out of 9⁄16 in (14.2875 mm) steel, with 11-gauge (1⁄8 in or 3.175 mm) sheet metal jackets, 1⁄2 in (12.7 mm) thick head shields on the ends of the tanks, and improved valves over previous designs.

[2] In order to implement the DOT-117 standard, the FRA and TC required that all new tank cars constructed after October 1, 2015 be built to the specification.

[2] The agencies also imposed a retrofit schedule to bring in-service cars up to DOT-117 standards.

[1] Depending on the volatility of the cargo carried, DOT-111 and CPC-1232 cars would be banned in certain services in a series of cut-off dates, with all such cars out of service or rebuilt by May 1, 2025.