DOT-117 tank car The DOT-117 is a type of unpressurized tank car in use on North American railroads. The DOT-117 design was developed in the aftermath of the Lac-Mégantic rail disaster of 2013 in an effort to upgrade the specifications of the then-common DOT-111 and CPC-1232 designs. It was announced on May 1 , 2015 by the United States Federal Railroad Administration and Canada's Transport Canada . The specifications require that the tank shells be constructed out of 9/16" steel , with 11-gauge sheet metal jackets, 1/2" thick head shields on the ends of the tanks, and improved valves over previous designs. 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.[ The agencies also imposed a retrofit ]schedule to bring in-service cars up to DOT-117 standards. 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.
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