I started a conversion on one of those great 2-8-0s years ago. I got the cylinders replaced, installed valve gear, installed a tender dog house, installed pilot-to-running-board steps/ladders, installed cab roof vents, etc. Then, like so many of my other projects, set it aside for when I get old. I just had my 75th birthday, so the time is now for getting it running. I think I was going to number it for one of the BLW high-numbered 1200's. I numbered my Bachmann for one of the Alco 1200's, which looks a little smaller than the MDC model. I also have one of the Athearn light Mikados. It can barely pull the tender, much less a string of cars. It needs more weight over the drivers. Good luck.