Originally Posted by Sniper X
It has a big round pad under the center and it "walks" or scoots by picking the pad up off the ground with a couple arms that have long horizontal feet on them and moving the pad forward or backward. Imagine it as if you sit on the floor legs sticking out forward, and pressing on the floor with your hands picking your butt up off the floor, and ricking forward then letting your butt back down on the floor. I call it the imperial walker. It is weird since you can't FEEL any of this happening when it is underway if you are inside it.
The Discovery Channel ran a story on large drag lines and shovels a couple of years ago. Some serious shit! They are all assembled on site because of their size. The part about how they move, as you described, or some they showed that "walked"....very cool.