The train only runs a return route of 3km on flat track. It looks as if the train is battery powered with the batteries being charged from solar panels both on the train and at the station. It seems unlikely that the train alone could hold enough solar panels to keep the batteries charged, even when factoring in time spent waiting at the station. Mains power can also assist in charging the batteries when solar is inadequate (which is possibly all of the time?).
This train was originally planned to be diesel powered but has now switched to electric, I'm guessing due to protest from the local community.