Arnold,
Everyone of my track feeds is terminated with a terminal strip as others have discussed. White-black is my wire convention for AC track voltage. I use color tape or label maker to denote which main line the wire is associated. In my case I have Blue, Yellow, and Red main lines. In the photo below I use a larger terminal strip to feed two main lines.
I use a method called Home-Run Wiring with wire pairs going from a central distribution point to each of the feeders. (I use some daisy chaining)
