1. Steel rail is the main component of railway track. Its function is to guide the wheels of rolling stock to move forward, bear the huge pressure of the wheels, and transmit it to the sleepers. The rail must provide a continuous, smooth and least resistance rolling surface for the wheels. In the electrified railway or automatic block section, the rail can also be used as a track circuit.
2. The rail sleeper must not only support the rail, but also maintain the position of the rail, and transfer the huge pressure from the rail to the track bed. It must have a certain degree of flexibility and elasticity, it will not work if it is hard, it will not work if it is soft.
7. Rail support is a component installed on the outside of the rail in order to effectively resist the lateral force of the wheel and rail. Rail stays are generally installed on the outer side of the outer strands of the small-radius curved track to prevent excessive lateral force from causing excessive lateral displacement of the track when the train passes the curve, and even causing the rail to tip over.