Here's an interesting series of photos I found at NE Railfan.net that document the history of the Alco FA-2 on the B&O. The photos also record the various paint schemes applied to freight locomotives over those years.
Doesn't this Alco FA-2 look nice and fresh? It should. The date of the photo is 1950 and the location is Schenectady, NY. Fresh from the Alco factory!
Here we have Alcos in action - hauling coal. Looks like early spring and the location (not given) could be western Maryland or West Virginia.
This photo shows the next evolution of the blue/grey paint scheme in which the light grey has been replaced with another shade of blue. Not one of my favorites.
The sunrise scheme.
Near the end - 1970-71 in "blue dip". None would survive into Chessie System.
Love the B&O. Loved the Alcos.
-RM