The difference between steam locomotive and diesel locomotive

First of all, the principle is different

Steam locomotive: the principle of steam locomotive is to convert the chemical energy of coal into heat energy, and then superheated steam enters the steam engine to expand and do work, pushing the piston of turbine to reciprocate. The piston changes the reciprocating linear motion into circular motion through the connecting rod and rocker, and the wheel with the motor rotates, thus pulling the train forward.

Diesel locomotive: The principle of diesel locomotive is that the thermal energy of fuel is converted into mechanical work, and the power generated by diesel engine is transmitted to the transmission device. Through the control and adjustment of diesel engine and transmission device, the vehicle is towed or pushed by traction device.

Second, the composition is different.

Steam locomotive: Steam locomotive consists of boiler, turbine, frame, running gear and coal water wheel.

Diesel locomotive: Diesel locomotive consists of diesel engine, transmission device, auxiliary device, running gear, braking device and control equipment.

Third, the power source is different.

Steam locomotive: The power source of steam locomotive is the chemical energy of fuel (usually coal).

Diesel locomotive: The power source of diesel locomotive is diesel engine.

Baidu encyclopedia-steam locomotive

Baidu encyclopedia-diesel locomotive