I echo that "don't take the TrAAin" message.
Walk it in combo w/ the moving sidewalks; it's actually faster in a lot of cases and you (hopefully) won't "break down" in between stops like the TrAAin sometimes does (I and others have missed flights due to this...).

Also would agree that it's very important to check the monitors as you deplane at DFW; the info the FA gets from the company (when and if he/she makes the in-flight cabin announcement) can change between the time you get it and the time you arrive at the terminal. You've got plenty of time to make your connection; enjoy your flight!