From the way that rolling stock is riding, whoever looks after the road on the Cumbrec & Toltec is doing a damn fine job; especially when you look at the train from head on going over that check-railed bridge, you can see how narrow the gauge is compared to the width of the loco, so even a slight variation in rail height would really make it roll!
Both the D&S and the C&T run tourist passenger trains in spring, summer and fall, usually with steam. When fire danger is too great then with a diesel. The trains shown here were photographers charters, the C&T can be easily chased from Chama to Cumbres and a bit further, then disappears into the wilderness. The D&S is mostly flat until Rockwood? Then into the wilderness until Silverton. The FCAB is both chaseable and runs enough trains to stake out locations. Cumbre Pass is a great location, a 4x4 is recommended. If chasing towards the Bolivian border, a full gas tank is essential, and again a 4x4. This is the Atacama Desert, ain’t much out there. NO gas at the border.