Railway transport is the transportation of passengers and cargo using wheeled vehicles, specifically designed to run along the railways and railways. Rail is an integral part of the logistics chain, which promotes international trade and economic growth in most countries.

A typical railway / rail consists of two parallel rails, usually made of steel, attached to the cross-beams, called sleepers (UK) or “linkages” (USA). Sleepers to maintain constant distance between two rails; measurement known as “tracks” of the track. To save the alignment track, it is either laid on a bed of ballast, or affixed to concrete solid foundation, and all mentioned as a way Standing (UK usage).

Railway rolling stock, which was installed with metal wheels, is moving to low-friction resistance as compared with vehicles and on the other hand, locomotives and power cars are usually rely exclusively for traction on the point of contact with the wheel rail, from where they receive adhesion that is part of axle load is transferred, which makes wheel “join” to smooth rail. Although it is usually sufficient in conventional railway dry conditions, the clutch can be reduced or even lost by the presence of undesirable materials on the rail surface, such as grease, ice or dead leaves.