Careless_Bat2543 t1_iyltdvb wrote
Reply to comment by Favicool 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
In addition to what others have said (which is correct) that still means you have to unload every train and reload another at the point where they meet. In the days before the modern standard container that took a good amount of time. Additionally it means you had to run twice as many trains (meaning twice as many engineers, a lot more maintenance, separate production lines for parts etc.) it just made things a ton more difficult.
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