that's part of it, but the biggest obstacle is power output--steam can't compete
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fastest steam engine in history, the Mallard, hit 126 mph at top speed
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the Tokaido Shinkansen *opened* at 125 mph in 1964, has only gotten faster since
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the fastest HSR in regular operation right now is 200 mph, using electric power
6:24 AM - 8 Dec 2016
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