@turkey_hollow_rr posted:EDIT: my apologies if I've confused Legacy and TMCC. MTH can only talk TMCC to Legacy base.
That's not accurate. The DCS App can send Legacy specific commands to Legacy locomotives through a SER2 connected to a BASE2 or BASE3. Not all Legacy commands are available, but most are.
MTH had to purchase a license from Lionel to gain this functionality with the DCS APP.