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© KYODOJR Central unveils 1st battery-powered bullet train
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© KYODO
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kohakuebisu
Bungle's right in that the headline is far grander than the story. Its a train with batteries for emergency backup power only.
Shink lines are mostly bridges and tunnels with little on the actual ground. So the risk of being stranded when the thing stops is actually very high. It will be much higher for the mag-lev, whose line is one long tunnel. The maglev's power consumption is super-high though, so batteries will be a non-starter.
The Hokkaido earthquake also proved that a small localized earthquake can leave a huge prefecture without power for days. That is how bad the grid is in parts of the country. So backup power for a train might be a good idea, but only because of a lack of resilience in the system as a whole.
Wolfpack
When they come up with one that runs on a rubber band - then I'll be impressed.