The crawler-transporters are a pair of, and after each launch return to the pad to take the platform back to the VAB. The two crawler-transporters were designed by Bucyrus International and built by Marion Power Shovel using components designed and built by Rockwell International at a cost of US$14 million each. When they were built, they were the largest tracked vehicles in the world. The German Bagger 288 excavator is now the largest tracked vehicle in the world, although the crawler-transpor… (More on Crawler-transporter)