High-speed rail's ability to run, depends on the traction power supply system for high-speed trains.
The primary load of the traction power supply for electric power system. (Germany is an exception: German high-speed grid independent German state grid)
Therefore, high-speed rail traction power supply system including overhead catenary, traction substation, return circuit,
Electric power system and traction power supply system
A description is:
Traction substation for overhead contact line, high-speed train can retrieve the car electrical energy overhead contact line, frequency conversion motor to make the train operation.
