I believe that is an airliner taxi trainer. It has a 777 cabin on a motorized frame that allows trainees to get the feel of how an airliner handles on the ground. The cockpit is at the same height above the runway as the real thing, and the pivot point is similar as well.
I believe this is a picture of what you're seeing, or something quite similar.
I believe this is a picture of what you're seeing, or something quite similar.
http://www.proctorp.com/img/48346g1.jpg