Electrified railways refer to railways that use electric traction. Also known as electrified railways. On electrified railways, electric trains (trains and EMUs pulled by electric locomotives) are operated, and there is an electric traction power supply system along the railway line that supplies power to electric locomotives and electric vehicles (referred to as electric locomotive EMUs). The power supply for electrified railways comes from the State Grid. The high-voltage AC power from the State Grid of China is sent to the traction substation of the railway for the first voltage reduction, and then to the overhead contact network above the track. After obtaining current from the contact network, the locomotive undergoes a second voltage reduction and rectification into direct current (which can also be rectified in the traction substation) to drive the direct current motor. The electric motor drives the axle of the locomotive to rotate, and the locomotive can pull the carriage forward
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