@Lou1985 posted:So long of the short is if you want to be able to operate a DCS locomotive from a Lionel Base3 Lionel and MTH would have to get together and develop a way for the Base3 to talk to a TIU and tell it what commands to issue to DCS locomotives.
And this gets back to software. TMCC commands are open to the public. MTH was able to write software to issue TMCC commands to a Legacy base and have it transmit commands to Lionel engines.
DCS software is proprietary and protected. Not possible to write software to talk to a TIU without that knowledge so a Legacy base has no way to communicate with a TIU.