T-Man, when it gets to the other end, there would be no delay, since there's no power interruption to stop the trolley. It would just hit the bumper, reverse, and be on it's way.
I think I'd probably use a short isolated track section on each end to charge a capacitor across a relay, the end track would be powered when the relay was open. You could then make the delay as long as you liked by using a larger capacitor. To minimize the current through the track section, I'd probably use a Darlington transistor to actually switch the current to the relay & capacitor.
My only problem with this is I'd like the lights to be on in the trolley while it's at the stop. Perhaps LED lighting with a large cap would solve that problem as well.
