Using a (sadly now discontinued) upgrade kit from the ERR company, I have successfully converted a conventional Lionel Gantry Crane (1970's version) to TMCC control. I had some high-level help, but the main part of the work was pretty straightforward. The main component used in this conversion, the ERR Mini-Commander board, is still available for sale and I have found it to be a very useful and flexible product for upgrading post war Lionel accessories to Command Control. If anyone is interested in how I accomplished this conversion, I could give more details. The crane has two DC can motors and the original manual control pod is disconnected and put aside. I purchased the crane on E-Bay for $75 and spent an additional $50 on upgrade parts, making the resulting TMCC crane a bargain by today's pricing standards. The ERR Mini-Commander board can control two DC can motors independently and this makes it very flexible for upgrading any Lionel accessory using motors to operate. The crane I have uses a magnet to pick up scrap metal and I can energize it or turn it off using my Lionel TMCC controller. I'm no electronic genius so, if I can do it, you can too! Cheers.