Greg, this is totally doable to TMCC/RS from ERR. Highly recommend preparing a check list of what is entailed. Is it worth the effort? Its your call; have done about 10 of these MTH to TMCC as MTH are nicely made. Issues: the antenna cannot be grounded so I use the tender shell for an antenna and isolate it from chassis with kapton tape and nylon screws. The smoke unit; you can use the MTH unit; just replace the element with about a 25 OHM element powered by the R2LC; the fan motor needs about 5V DC. Gunrunner John on this forum has two neat products that will enhance smoke output and chuff control. The boards from ERR are compact, robust and pretty straight forward to install. I think the manual uses a reed switch for chuff generation but but GJ's chuff generator is cool. You also will need to keep the tether from MTH to connect the electronics in the tender to the loco; all lighting will have to be swapped out; coupler will work fine. The above are the major players I can think of. Be advised you are going to receive all sorts of input; the forum has some great info under the Control System Thread under Lionel TMCC/Legacy/ERR; it is doable and you will enjoy it; there is a learning curve; just be patient and keep it simple. Good Luck; Falcon70
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