I have a TIU and a remote and my other MTH engines work fine. This one is programed into the remote and I tried it on a test track and It still starts up when track power is applied.
I have another TIU with a WIU hooked up. I can connect to the TIU network, but when I try to add an engine, it tells me either TIU can't be found or there's a connection error. Lionel is soooo much easier!