The invention discloses a tank car. The tank car comprises bogies, a storage tank, a pipeline safety system, traction bolster devices and braking devices; the pipeline safety system is connected with the storage tank, the traction bolster devices are arranged on the bogies, each traction bolster device comprises two traction bolsters which are fixed to the two ends of the storage tank respectively, each traction bolster comprises a traction beam, a cross beam, a bolster beam, an end beam and side beams, and the braking devices are arranged on the bogies and fixed to the traction bolster devices and the storage tank; the cross beams, the bolster beams and the end beams are fixed to the corresponding traction beams in parallel, one end of each side beam is fixed to the corresponding end beam, the other end of each side beam is fixed to the corresponding bolster beam, and the ends of the storage tank are supported on the bolster beams and the cross beams. By arranging the tank car, frozen liquefied gas can be transported through railways, the transportation cost of the frozen liquefied gas is reduced, and the long transportation distance and the high safety are achieved.