Denver and Rio Grande Western
In a previous post I had mentioned that one of my favorite railroads was the Burlington Northern, mainly because of the green and white color scheme and BN logo during the Pre-BNSF days. Scenery is also a big part. BN has to do with the open fields of the mid-west, and DRGW has spectacular mountain scenery.
I've also always been a fan of the Rocky Mountains and Colorado in particular. The Denver and Rio Grande Western color scheme, especially the yellow locomotives, have been a favorite of mine for some time. In fact my dad made me a wooden train with pretty much the same color scheme. It was probably coincidence though as I would have been too young to have expressed an interest in any particular railroad.
The mountain scenes that the Rio Grande Western sees are spectacular. The tunnels, snow sheds, winding track, various bridges across rapidly flowing streams and rivers all give a lot to the wonderful effect traveling along a railroad line.