the "high speed" lines on the NE corridor have 20mph sections
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*high speed trains
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23 mph limit in Tehachapi: http://www.railpictures.net/photo/372128/
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Trains only make sense in Japan
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Hybrid track shared by all kinds of trains, not a dedicated bullet train track. Not sure it is a good idea for a freight train (say carrying chemicals) to be doing 80 in a densely populated area
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Or in 19th century
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How about clear signalling of such zones, plus a useful train control mechanism?
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Very common for rail lines in most countries to have some slow sections; anywhere it needs to turn sharply in particular. There’d normally be automatic speed limiting these days tho.
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