Personally, Dan and Tac, you are right about having to use the engines, but I must say that if it werent for those people who collect and have the engine as mantel clocks, we all would not have the opportunity to once in a while ccome across some unused or very little used engines.Recently I bought an Aster Western Maryland Shay (RTR) in pristine condition. Never used, with the original box, tools, etc. and I am very happy. Right now, I do not have a track ready, so I rather have them on display than on their boxes.