![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Crawler-Transporter.jpg/300px-Crawler-Transporter.jpg)
Credit: NASA
Crawler-Transporter #2 beginning a road test on December 21, 2004 after replacement of the shoes on its caterpillar tracks.
Crawler-Transporter #2 beginning a road test on December 21, 2004 after replacement of the shoes on its caterpillar tracks.