A driver works the controls inside the cab as it makes the trek on the crawlerway to Launch Pad 39A.

A driver works the controls inside the cab on crawler-transporter 1 as it makes the trek on the crawlerway to Launch Pad 39A at NASA’s Kennedy Space Center in Florida. New jacking, equalizing and leveling, or JEL, hydraulic cylinders were installed on CT-1. They will be tested for increased load carrying capacity and reliability.

The Ground Systems Development and Operations Program at Kennedy continues to upgrade the crawler-transporter as part of its general maintenance. CT-1 could be available to carry a variety of launch vehicles to the launch pad. Two crawler-transporters were used to carry the mobile launcher platform and space shuttle to Launch Complex 39 for space shuttle launches for 30 years. Photo credit: NASA/Jim Grossmann