Crawler-transporter

NASA's two crawler-transporters were built in 1965 to carry Saturn V rockets, and they still do the same job, moving the Space Launch System rocket and Orion spacecraft to Launch Pad 39B at Kennedy Space Center. Crawler-Transporter 2, upgraded to lift 18 million pounds, was named the heaviest self-powered vehicle by Guinness World Records in 2023, at about 6.65 million pounds. Patience is part of the deal: it creeps along at about 1 mph loaded, so the roughly 4.2-mile trip to the pad takes eight to 12 hours.