Those look fantastic, John, along with the rest of your scenes. How did you make the smooth sides? I've used the New Ray smooth models but cut down the wheel mounts so they don't look so off-road capable. I also made styrene hitches for 40' flatcars...as you can see, I've got a long way to go with both the models and the layout.
I used the New Ray tractor trailers too. I love their look too.