OK Guys, it looks like I can construct a piece of insulated track very easily.
So, it looks like the Lionel Mainline gate is the way to go.
But, Vinny, am I to understand that if I get the Lionel Mainline gate, I don't need to buy a relay of any kind? I just hook up the wires as you described?
no relay is necessary. As was said Make sure you get the newer ones with just three wires You will not believe how easy they are to install