Right, I've got the story up on my deviantART account. The story starts here. You can follow the links in the Artist's Comments section right below the actual page.
I did make some changes from the original plan. The problem I had with the original outline was that is that I had too many branches in the tree and that gave me problems around the "Great Depression" period of the story. What I did instead was narrow down the choices. Instead of choosing from four locomotives at the start of the story, you only have to choose between two.
This made the story a lot easier to write.