OK- Where are we? The left side looks Three Forks-ish. The right almost seems like a different place. Boxcab E50
Same locale, different eras. the top left corner pic, you notice the rail doesn't continue along. That is a nice picturte though, a little more blending of the edges and it'd be truly awesome.
So, what is the date on the older half pictured? With a passenger train, it's got to be no later than 1963- Before they cut off the "Deer Lodge Special" version of 15/16. With a '56 Chevy showing, it's no earlier than that. Boxcab E50