I didn't see any moving walkways in DFW in Terminal C. Do they have any in any terminal? Seems like they ought to for an airport of it's size but maybe not..
There is a photo of walkways in the google map gallery, which shows a 360° view with a DFW sign visible. https://goo.gl/maps/VELoZojtUZJ2
Judging from the escalators at either end of the walkway, this appears to be beneath the tarmac and used to connect between two terminals.