Batteries are still heavier than your typical commuter train diesel engine and tank. The diesel commuter trains are usually diesel hydraulic in Europe, so much

Batteries are still heavier than your typical commuter train diesel engine and tank. The diesel commuter trains are usually diesel hydraulic in Europe, so much less weight than you might expect, e.g. https://en.m.wikipedia.org/wiki/DBAG_Class_612 https://en.m.wikipedia.org/wiki/DBAG_Class_612