I don't understand why DCC continues to be mentioned as a command control system in the 3 rail world. Neither MTH PS2 or Lionel TMCC or Legacy can run on track powered by DCC. I do like BlueRail which is a quasi DCC option that can run on AC power.
Glad you qualified that DCC comment. Starting at 2:45 through 3:17 in this video is a BlueRail DCC, Legacy and DCS all running on AC track power. I could have added my LionChief to this track also and had 4 different systems. But holding 4 different controllers can be cumbersome and confusing.
But my Son and I routinely run our trains together. His Legacy and DCS engines and my BlueRail engines.
Let's not leave out deadrail as an option too. I mean, if we are going to overwhelm the OP with choices, we might as well give him everything to consider.