Sorry....I can't help. There have to be lots of places, though. Once you get out of the cities proper, there's nothing but unobstructed views. I've often wished I had a chance to prowl around the Flagstaff area with my camera. The BNSF runs through there, and being a mountainous area, the trains usually have lots of power on them. Also, I've been a fan of the old Santa Fe since I was a kid. Trust me when I tell you, that's a very, very long time. They always had the coolest looking equipment, and still do, even after the merger.
The UP runs through Phoenix and Tucson, and that's not all that interesting for me because it's the same line that runs through here. I'm really sick of looking at yellow locomotives.