What's the big deal about railroad tracks?
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[0] https://www.snopes.com/fact-check/railroad-gauge-chariots/
Fact checked by Snopes (read the comment of motdiem: https://news.ycombinator.com/item?id=21099365)
The true source is from a humor site: https://aviationhumor.net/the-us-standard-railroad-gauge-is-...
It's an interesting example of a compromise where having just one standard is preferable to trying to find the perfect standard.