At least your engine stays on the track, all of my drive wheels are out of gauge, if i move them they will be out of quarter.
I still have yet to affix the firebox flicker LED to the back of the boiler, but you get the idea.
The only thing that's annoying is that it seems like the only thing picking up power is the tender wheels. I did a resistance check from the locomotive wheels to the tender wheels, and the multimeter went back and forth between 1 and 2.1Ohms, which tells me electrical contact is intermittent at the best. Not sure if I want to try to take this apart or not to increase the electrical contact pickup.
http://www.youtube.com/watch?v=VoXjzsxCiVg&list=UUl11pFo9NA5qdKuOgrefyeg&index=1