The carriage underbed includes two longitudinal beams in the lengthwise direction of the truck body, several crossbeams and several wing supports.

• 所述车厢底架包括两根沿车体长度方向设置的纵梁、垂直于纵梁的多根横梁和若干翼撑，其中，所述纵梁采用腰宽小于腿高的槽状型材，槽口朝上布置；