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>battery powered
It’s on rails, dumbass! Just do direct power transfer. You then don’t have to deal with range issues, inefficiencies due to battery resistance, battery decay, or battery waste! But that would be using proven technology from the 50s, and you need your freight subway to look futuristic.
Also tight tolerances aren’t good, especially with turns, which have to happen.
And Texas, California, and that whole area of the country is a mess of wind, seismic, and glacial runoff activity. Underground stuff it’s generally bad, since the ground will shift, and tight tolerances over distances even worst.