I must be loosing it. Many years ago I ran a small layout with O22 switches and fixed voltage, but cannot recall the way I had it wired. I'm helping my grandson set up his layout and we are powering with a KW transformer. I have four O22 switch tracks with their fixed voltage plugs connected.
The track power is terminal A to the outside rails, terminal U to the center rail. Which terminal should I use to supply fixed voltage to the switch tracks ?