Assume you can hook every locomotive and car Union Pacific owns up into a single gigantic freight train. Safety and laws aside, would it work?
In: Physics
There is no hard physics limit, as long as the engines are coordinated.
7.3km and 100,000 tons here:
https://web.archive.org/web/20160107175613/http://www.railwaygazette.com/news/single-view/view/bhp-breaks-its-own-39heaviest-train39-record.html
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