My country currently testing on EV locomotive with cooperation from China but problem is it can't even run on commuter range (150 km from central station) note : the car behind the loco is additional battery
I think the London Underground have some battery-powered locomotives that are used for maintenance and similar operations. The idea was that you did not want diesel fumes inside the enclosed tunnels. It didn't, however, need a trailer to carry its batteries (but doesn't need to go that far anyway). Do you happen to know what the intended purpose of your battery-electric train is?