The railway track is the main component of the railway track.

Its function is to guide the wheels of rolling stock to move forward, bear the huge pressure of the wheels, and transmit them to the sleepers. The rail must provide the wheels with a continuous, smooth and low resistance rolling surface. In the electrified railway or automatic block section, the rail can also Also used as a track circuit.

Heavy rail: Steel rails with a nominal weight of more than 30 kilograms per meter belong to heavy rails. Heavy rails can be divided into two types: general rails and crane rails. Among them, the standard rail length is 12.50 meters and 25.00 meters, mainly including light rails, heavy rails, rails for industrial elevators, crane rails, conductive rails, switch rails and other rails and rail accessories.

The heavy rail has a larger section than the light rail and can withstand greater forces.