According to the power different targets, divided into overhead catenary suspension and contact rail

Along the electrified railways, urban transport line to set up an electric vehicle running special form of power lines. From the traction substation power through the catenary and installed in the car by the inverter to air circuit breaker locomotives or electric vehicles. Usually require catenary in any meteorological factors (ice, wind, rain, snow, etc.) and the maximum power transformers to ensure security of electricity supply, and good wear resistance, corrosion resistance, dielectric loss and other properties.
Classification according to circuit breakerscontact rail (third rail) two basic forms. Overhead catenary can be suspended in accordance with the number of vertical lines and features cable is divided into simple suspension and catenary two kinds. The former big sag, suspension flexibility uneven, mainly used in mining locomotives tram or online;