Here is my version of the Constitution Express. I have like so many others modified it to have working running gear. It was more tricky than I imagined and I went through several versions until getting one I was happy with the look of.
I tried using the original wheels, like those on the tender, but they kept hitting the running gear. I did try having the front truck as just two wheels, but then there just seemed a big gap. I tried moving the truck forwards, but again too much of a gap, it just looked silly. Eventually I made the truck as thin as possible and used the very smallest train wheels and it seems to work a treat.
It is quite a small locomotive actually so the Power Functions gubbins is all in the tender.
I then found I had enough bits to actually make another one in red and black. I really wanted to use the red wheels on it, but I lacked them in the ones that fit on the motor and also I have never seen any of those smallest train wheels in red? I am not sure that they even make them, I have some in black and white and that is it.
Now I have two of them I did a name for the red and black one, any ideas?
I have made a Western style carriage in both green (Not Dark Green, I don't have nearly enough.) and red, one for each engine. I'll post pictures when I have processed them.