It is interesting (to me), that the problem seems to be with DCC having too much power on the rails. That answered a fundamental question I had, how could DCC signals corrupt TMCC or Legacy given they generate their command signal over house wiring. I could see it interfering with DCS signal, since both are put through the rails (though operate differently, I don't know if DCC is 2 way the way DCS is).
Anyway, you learn something every day on here. Me, personally, given that it isn't that hard to wire for legacy, and DCS isn't rocket science, if I want to run engines from both I'll put in both *shrug*. The OP could also just install DCS and wire it to a Lionel track interface unit, and control both sets of engines (albeit not fully using legacy commands....). DCC to me doesn't make much sense given the context of three rail O as it stands.
