The World’s Longest Train Worked — So Why Did It Only Run Once?

A train over 7 kilometers long. Eight locomotives. One driver. An engineering experiment that worked—but never became an everyday service. In 2001, BHP assembled 682 loaded ore wagons for an extraordinary journey through Western Australia’s Pilbara region. The challenge wasn’t just getting this enormous train moving. It was controlling the forces running through thousands of connections, wheels and rails. Discover how distributed power allowed one driver to control locomotives spread throughout the train, why braking and curves become major challenges at this scale, and why a record-breaking achievement isn’t always a practical solution. Would you want to watch this entire train pass? Tell us in the comments. Subscribe to Curious Engineering for more giant machines, world records and extraordinary engineering. This video combines real footage and photographs with AI-generated visual reconstructions. #LongestTrain #Engineering #BHPIronOre