Yea, I think they have big diesel generators for traction power and smaller generators for hotel loads (lighting, heating & AC, etc.).

I ride a diesel loco commuter train to work every day, and it has happened in the past that the auxiliary generator will break down but the train can still get underway. No lights or ventilation - but we're moving.

Radar

There are 10 types of people. Those who know binary, and those who don't.