I love this picture. The slide is dated June 1982 and it doesn't list the location, though I believe it is in Clifton Park where the north/south D&H main line branches east towards Mechanicville. It features a nice, bright solid-blue Boston and Maine GP7 pulling a train of various, colorful freight cars. It is the type of thing that would be perfect for a model railroad.
An online picture of B&M #1573 dated 2/18/1980 shows it still with the white vertical stripe on the end of the short hood. Thus, the paint on the engine below is relatively new (less than 2 years old), and it shows.