Want to spice up the scene in your river? Here you go. Try putting a couple of steamers in it.
And of course, it's prototypical, so you don't have to worry about that. Plus, think of all the fun you'll have explaining this scene to your guests. They'll think you're stupid, but who cares?
P.S. - The mail must go through, you know.
P.S.S. - Don't try this with diesels.