There is a great quote on government spending from the movie Contact. Don't worry if you didn't see the movie, it wasn't that good. The quote applies very well to model railroading as well: "Why build one when you can have two at twice the price?"
And so it goes with the new Skally engines. I figured why not build both the SD40M-2s at the same time? The details are a little different, but the paint and decals are the same. I still need to do some more research into SCXY 1325, to make sure I get the details right, but I had a couple of photos to work from already.