Enclosure for Launch Pad 3 is at the end of this long track. The enclosure helps maintain constant temperature for the payload equipment until the rocket is ready to launch. Then the enclosure is rolled back along the track. Part of Pad 2 is visible on the far left of the image. Image is 31% size of original.
Image by Nick Strobel. Please ask for permission if you want to use this image in any sort of electronic or hardcopy publication.