Diesel tank truck for railway

The utility model particularly relates to a diesel tank car for a railway. The diesel tank car is used for solving the problem that the assembling and welding seam quality among matching surfaces of an upper cover plate of a traction beam, a wedge-shaped connecting plate and a tank body are difficult to guarantee at present. The tank truck comprises a tank body, tank truck traction and bolster devices mounted at the two ends of the bottom of the tank body, a loading and unloading valve mounted at the bottom of the tank body and a top valve group mounted at a manhole in the top of the tank body through an adding and discharging large cover; the tank car traction bolster device comprises a traction beam, and the traction beam comprises a first lower cover plate, a first web plate, an upper cover plate, a second lower cover plate and a second web plate; one end of the upper cover plate is a horizontal plane, and the other end is an upward bent inclined plane; the rear end of the upper cover plate is connected wi