Minecraft circuit that once activated stays active until reset?

I am making a subway system for my minecraft place, and I want to have it set up like this. Just ahead of each stop/detour there is a button that you press, that changes an intersection for you to take. On the other side of the intersection is a pressure plate track to reset it, so basically, you press the button, the track changes and doesnt go back to normal until you cross the pressure plate. How can I set this up?