RADCAM
The wire "bundle" running through the joists contains a 18 VAC 12 gauge railpower bus, which energizes the T-strips where I then connect a short drop wire down from where it is soldered to the rails above for both hot and common. I solder power to every 37 " section of Gargraves flex track plus between all Ross switches. The T-strips are just a handy way for a secure connection of the drop wire. Other methods work--some folks use wire nuts or pressure clips. some solder the drop directly to the bus. I prefer T-strips.
I addition there are T-strips for Switchstand lights, strips for potential building lighting/accessories and for the individual Tortoise track switch motors. Each individual track switch will have wires running from its individual toggle control switches way back at the track schematic that operate the switch points. I have a fairly good idea of where track switches and accessories will be located when I prewire before covering the joists with plywood. ( I emphasize track switch to distingush from electrical switches).
The wiring/T-strips (pictured below) gets "busy" under my Service Yard which has quite few track switches, Tortoise motors (about 9 shown in this photo) and accessories as well as many soldered railpower track connections.
Track switches operate from this simplistic schematic of shelf liner and auto striping. The position of the toggle handle indicates at a glance whether the track switch is set to "thru" or "out". The layout power center is mounted on wall below.
