Stop in Golden Colo at the RR museum. Worth the time. Also have you considered a detour to get off the interstate and go through Antonito and Chama? I would do that before the museum. No need to ride the train, just look at the great scenery, the train, and a look around at a working steam operation in Chama. If you stay in Chama you can watch the crew putting them to bed and then in the morning getting ready to head out.