This was presumably before they built the open-air platform car, as the train that day had just the one coach.
Shown here running around the coach to prepare for the return to Santa Fe, locomotive 93 is the same one that pulled the train I wrote about yesterday. It's painted in a variation of the "Kodachrome" scheme used by Southern Pacific and Santa Fe during the run-up to the aborted merger of the two lines. Note Lisa's Big Orange Van parked in the distance.
I hope that the new SFSR manages to get rolling with GRRM's backing and that they can make a going concern out of it. I'd like to ride it again, possibly connecting to it from Albuquerque on the Rail Runner.