The driving principle of train wheels involves many methods, including steam engine driving, electric driving and internal combustion engine driving.

In the age of steam engines, steam engines used steam pressure to drive pistons to move and transmit power to the wheels. The wheels are connected according to the wheel-rail method, and the friction between the wheels and the track propels the train. With the development of technology, electric drive has gradually become mainstream. The principle of electric drive is similar to the working principle of electric motor. Electric power is supplied through the grid to the traction converter. The converter converts the electrical energy into energy of the electric motor. The electric motor propels the train by transferring energy to the wheels. In addition, some trains are powered by internal combustion engines, which convert fuel into power to drive the wheels.

Regardless of the drive mode, the speed and direction of the train are controlled by the traction control system. The traction control system adjusts the magnitude and direction of the traction force according to the set speed and instructions, thereby realizing the acceleration, deceleration and direction changes of the train. The traction control system uses a combination of electrical control and mechanical transmission to control the working status of transmission components such as traction motors and gearboxes by adjusting electrical parameters and mechanical parameters, thereby achieving precise control of the train.

In short, the driving principle of train wheels is to transmit power to the wheels through power sources such as steam, electricity or internal combustion engines, and then push the train forward through the friction between the wheels and the track. At the same time, the traction control system accurately controls the speed and direction of the train to ensure safe and efficient operation of the train.