Steel rails are railway equipment and important railroad equipment, and steel rails are the main symbol of railway equipment. In order to effectively resist the lateral force of the wheel and rail, a component installed on the outside of the steel rail. Rail supports are generally installed on the outer side of steel rails outside the small radius curved track to prevent excessive lateral force from causing excessive lateral displacement of the track when the train passes through the curve, and even causing the steel rail to tip over. Generally, rail stays are used for wooden sleeper rails. In most railway turnout points, rail supports are also installed on the outer side of the basic rail to improve the lateral rigidity of the steel rail. The shape of the rail supports is also more.
When the train is running, the longitudinal force acting on the steel rail is often generated, causing the steel rail to move longitudinally, and sometimes even driving the railway sleepers to move together. This longitudinal movement is called crawling. Crawling generally occurs in the main line of the double-track railway, the heavy vehicle direction of the single-track railway, the braking range on the long downhill and when entering the station. The railway sleepers must support the steel rails and maintain the position of the steel rails, and transfer the huge pressure from the steel rails to the track bed. It must have a certain degree of flexibility and elasticity, it will not work if it is hard, and it will not work if it is soft. When the train passes, it can be deformed appropriately to cushion the pressure, but after the train passes, it must be restored as much as possible. Sleepers include wooden sleepers and concrete sleepers.
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