V6Ga t1_iykcn3p wrote
Reply to comment by InfernalCorg in TIL that the southern United States converted all 11,500+ miles of its railroads from broad gauge (5 ft/1.524 m) to nearly-standard gauge (4 ft 9 in/1.448 m) in just 36 hours, starting on May 31, 1886 by 1859
Bogies are swapped on trains pretty regularly:
https://www.youtube.com/watch?v=2nI467sc-Eo
Add the proven defense advantage in not having a common gauge, and no one is going to standardize rail.
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