Unlike any other industry that requires power, the metro industry requires a little bit of extra power since the train itself runs on the same electricity that powers the rest of the infrastructure as well.
There are many aspects to consider while designing the electrical supply system for metro trains such as:
Proper protection should be in place to make sure that the passengers do not come in contact with the transmission lines under any circumstances. Warning signs should be placed near dangerous electrical equipment that carries high voltage/current. Earthing should be in accordance with international standards and should be tested thoroughly. The third rail that supplies power to the train shall be implemented as per national and international standards