Nice capture. I love vintage locomotives. The photo sets a very nice and nostalgic mood. It would be nice to see a bit more detail in the wheels since that area of a locomotive usually has great detail and texture. Just my opinion. Love the shot.
Beautiful subject. Well exposed and the soft green background is nicely used. I would, however, remove the purple area directly above the subject's head. It is a bit distracting and one's eye goes directly to that spot.