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Not just in the USA. There was dual gauge in many countries. Indeed, almost anywhere more than one gauge existed, there would be some dual gauge somewhere. In the past, there were some places with triple gauge, but I don't know of any now that aren't test tracks or tourist lines. There must be some left somewhere in the world....
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Fan of Conrail... also PRR, Santa Fe, BN and SP, 70s-80s CN, pre-merger-era UP, heavy electric operations in general, DB and DR, Brazilian railroads in general... why bother trying to list them all?
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