Another way of saying it that worked for me:
a TIU Channel connected to a "hub" and from the hub "paired spokes" of hot and common going out to track. Just like a wagon wheel or air terminal hub. Another channel, another hub,=another power district/block.
A "hub" pictured below. A White [Common] and color-coded wire home-runned from a channel through the hub went out in pairs to the track. Adapted to DCS on an existing TMCC system and it worked pretty well.