I very nice shot! The contrast of the old BN workhorse against the greenery in the background gives it interesting contrast and a sight seen commonly all over the US and Canada. I live basically next to the CSX mainline in Marietta, Georgia and I've been sort of a train nut since I was a kid. Interesting to see power from other railroads as it stays with the train throughout the trip. The lead locomotive in that shot is an EMD (General Motors) SD40-2 built over 30 years ago. Many locomotive engineers consider the SD40-2 their favorite.
Aj