According to the v0.193.234 update "You may now connect rails to activation blocks. This allows you to use logic without needing to place the activation blocks directly adjacent to your rails -- potentially in the middle of nowhere. This will, however, disable touch logic for the specific rail block you’ve linked."
This does not work in current version 0.199.472. Connecting a Rail Basic to an Activation block using C-V is allowed but docking an entity to that rail does not turn on the activator, bor does undocking that entity. The old touch logic system does work.