The utility model provides a heavy track car for railway maintenance has the frame, and frame lower part both ends all are equipped with power truck, and the frame lower parts in the middle of two power truck are equipped with the fuel tank, and frame upper portion is equipped with the automobile body, and the automobile body front end is equipped with preceding cab, and the automobile body rear end is equipped with the back cab, is equipped with between the sleeping berth in the middle of the automobile body and the inter -machine, and the inside power pack that is equipped with of inter -machine, power pack pass through hydraulic transmission device and be connected with two power truck respectively and drive its rotation. The utility model discloses the highest functioning speed is 100kmh, and installed power is 1000kW, and engine power is big, can carry out large -tonnage shunting operation, the stable performance, and safe and reliable satisfies the rail yard and uses needs.