I second the recommendation of the Atlas Control Rails. In my experience, they offer the flexibility to locate the control rails right where they are needed for operating cars to work as intended, without having to cut the tracks for a UCS section.
One does have to be careful installing them, as the control rails need to be located midpoint of the center rail and the running rails. Mounting them too close to the center rail can cause loco pick-up rollers to short out against them.
~Chris