Daniel,
He likes to run the trains with our old cell phone. He has his own phone as well to use. I'm running all MTH DCS equipment using the MTH app and MTH remotes to control the trains. You can use just about any android device, as well as I phones with their own app version. I prefer to use their remote most of the time for the outside RR.
I have the older MTH app that controls most, but not all features. The new pro app does it all. I haven't downloaded it yet into that phone.
2 rail is still basically the same as three rail for electrical. A big selling point for three rail is the center rail provides the positive, and the engines can travel in opposite directions without the need for switching polarity. To the engine and the controller, they don't know any difference once they are set up. I also run G scale (and HO scale in the past) so I'm used to having only 2 rails.
I prefer the MTH system for it's simplicity in operations. I can run any engine together with any other with ease. There's no special programming or add on equipment needed. It's packed with features and upgradable for free to keep it current.
I don't know what the S/W question means?
