With the right cabling and both systems wired together according to the chart on MTH's DCS website, the DCS System will run Lionel Legacy and TMCC Locos. Here's a couple of interesting questions I have regarding using both systems:
-If I had LCS on a layout and was using both DCS and Legacy, will the DCS system control the LCS modules (or older TMCC devices like the ASC or SC-2) through the Legacy remote?
-What about the switches and accessories? If DCS will run Legacy/TMCC locos, will it run switches and accessories with built-in TMCC boards?