The crawler-transporters are a pair of tracked vehicles used to transport spacecraft from NASA's Vehicle Assembly Building along the Crawlerway to Launch Complex 39. They were used to transport Space Shuttles from 1981 to 2011.
The crawler-transporters carry vehicles on the Mobile Launcher Platform, and after each launch return to the pad to take the platform back to the VAB. Upon its construction, the crawler-transporter became the largest self-powered land vehicle in the world.
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