Robert,
Where does the Lionel Legacy 990 go into the TIU or does it go to WIU?
Use MTH cable #50-1032 to connect the TIU's serial port to a Lionel SER2, and then on to the Lionel Legacy command base if you want to operate Legacy engines in Legacy mode. If you merely desire to operate Legacy engines in TMCC mode from the Premium version of the DCS App, just connect the cable directly to the Legacy command base.
The need for the SER2 is because a Legacy command base cannot accept Legacy commands via its own serial port.
Could I run a Mth train and Lionel Legacy at the same time with the DCS App?
Yes, as per the above connection.
probably just grab the DcS Commander instead.
Bad idea. The #50-1028 DCS Commander is primarily designed for HO operation, outputs only 6 amps DC voltage regardless of what is its input and cannot be connected in passive mode so it would conflict with whatever transformer is powering the tracks. Further, it does not permit walk-around remote control.
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