The following answer is obtained by Expert Opinion
Electric locomotive working
The pantograph of the locomotive is connected to the overhead wire called catenary or OHE.
Electric locomotive uses single-phase high voltage 12,000 to 25,000 volts. The power is supplied to each motor and a normal locomotive has 6 motors attached, 1 on each axle. The power can be controlled from the cabin.
Work of an electric engineer in the electrical locomotive
Maintenance of electrical multiple unit, locomotives, traction distribution and mainline EMUs.
An electrical locomotive engineer is responsible for all the installation and operations for the power supply.