TL74 special wagon for prefabricated bridge is used to transporting prefabricated bridge on 1435mm gauge. There are removable loading and reinforcement devices for bridge (bridge support device) installed on the special wagon. When three wagons are coupled with each other (a normal wagon with equivalent length of 1.3m in the middle of two special wagons), the wagon group could transport T type prefabricated bridge with span distance of 32m and self weight below 148t. When the wagon is not used to transport prefabricated bridge, one 40ft ISO container or two 20ft ISO containers could be loaded on the wagon after disassembling the bridge support device and turning the international standard container twist lock to working position.