Railway accessories is part of the railway line, here referring to orbit, including rail, sleeper, connecting parts, ballast bed, climbing equipment, rail brace and switch, etc. As a holistic structure, track laying on subgrade, plays a guiding role of the train operation, direct motor vehicles and vehicle load under great pressure. Under the dynamic function of the train operation, the component part of it must have sufficient strength and stability, and ensure the train in accordance with the relevant provisions of the highest speed, safe, smooth and continuous operation.
