The DOT117 tank is used for transportation of flammable liquids. It’s a general service tank car but varies from the DOT111. The DOT117 tank car is required to have a steel jacket with thermal protection under the jacket to protect the car in a pool fire or torch fire. All valves are in a protective housing to protect them in the event of a roll over. The bottom outlet is protected with a skid plate and a bottom outlet that allows the operating handle to be put in the skid, removed, or disengaged in transportation. This helps prevent the opportunity of opening of the valve in a derailment. All the safety features of a DOT117 are intended to make it a safer vessel to transport flammable liquids.