@Ray Lombardo posted:My concern as well. Lionel locomotives have had numerous documented quality issues, as seen on this forum, but the operating system has always been solid. (And they seem to be cleaning up the QC issues on the locos, a positive sign.). Hopefully that aspect of Legacy doesn’t change. We will see.
It's a fairly logical conclusion that addition of the 2-way communication (most likely via Bluetooth) will not affect the current operation of their newer locomotives with this feature nor the operating system that runs them. If you buy a new 4 digit addressable engine, it still has to be backward compatible with the oldest TMCC systems out there which do not support 2-way communication. The "talk back" communication from the engine is not required to operate it, it's just a nice add-on feature for those who can use it.