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(strictly technically speaking not direct to grid but yes)

The problem is gaps in electrification. So you might have electrified two parts, but with a big gap without wires

This lets the train cross those (and mind you this would have to be something a larger gap, if it's a smaller gap without stops, let's say 1km, then the train just doesn't care)




Normal electric trains already carry batteries for this reason, and to be able to manuever off the track in case of a power outage. Much like trams.

There's a big difference however between a train with a short term battery backup and one that rides on pure battery power for an extended range.




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