Tank car body and railway tank car

The invention discloses a tank car body and a railway tank car. The tank car body comprises a sealed outer tank, and traction and bolster devices are fixedly connected to the two ends of the outer tank respectively; the inner tank is embedded into the outer tank, the inner tank is used for containing substances to be transported, the inner tank comprises four tank walls, and the four tank walls are connected end to end; each tank wall comprises a first straight edge part, a second straight edge part and a transition part located between the first straight edge part and the second straight edge part, the transition part is of an arc structure, and the transition part protrudes in the direction close to the outer tank. 本发明公开了一种罐车车体以及铁路罐车，所述罐车车体包括密封的外罐，在所述外罐的两端分别固定连接牵枕装置；内罐，所述内罐嵌入所述外罐内，所述内罐用于容纳待运输的物质，所述内罐包括四个罐壁，四个所述罐壁首尾相连；每个所述罐壁包括第一直边部、第二直边部和位于第一直边部和第二直边部之间的过渡部，所述过渡部为圆弧结构，所述过渡部朝向靠近所述外罐的方向凸出。