When I was building it I was never happy with the way the trucks looked
when I used a train motor so I ended up making the engine unpowered (is that
a word?). To power the train I built a small train car
(http://www.brickshelf.com/cgi-bin/gallery.cgi?i=4528) on top of a train
motor. I tried to make it look like something I had seen in an LGB catalog.
Because this car was so small it suffered quite a bit of wheel slippage.
Adding a boat weight brick inside has solved this problem.