Kennedy Space Center has been using the same two crawlers, nicknamed "Hans" and "Franz" for the bodybuilding characters, since their initial delivery in 1965. In their lifetime, they have traveled more than 3,400 miles (5,500 km), about the same driving distance as Miami to Seattle.
The crawlers were overhauled in 2003 with upgrades to the Motor Control Center, which houses the switchgear and electrical controls of all of major systems onboard, a new engine and pump ventilation system and new diesel engine radiators, and replacement of the two driver cabs on each vehicle (one on each end). NASA had planned to use the crawlers for the Constellation program after the Space Shuttle was retired in 2011; due to their age and need to support the heavier Ares V and its launch tower, NASA planned to modify the crawler's engines. With the cancellation of the Constellation program, the fate of the crawlers is unknown.
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