To drive the high-speed railway with electricity, first make the power grid transmit electricity, then use the traction transformer to convert the electricity to the appropriate voltage, and finally transmit the electricity to the high-speed railway through the contact line.
Usually, when we take the high-speed railway, we can see that some things like wires have been established near the track of the high-speed railway. This' wire 'is the overhead contact line connecting electric energy for the high-speed railway.
The power source used by the high-speed railway comes from the public power grid. During its operation, the power grid first transmits power to the traction substation. Traction substation is a device that can carry out voltage conversion. It will convert the transmitted power to the voltage suitable for high-speed railway, and then transmit these power to high-speed railway through the overhead contact line mentioned above to start the motor inside high-speed railway to drive the operation of high-speed railway.