I can't get the trolley car to return from the end of the track. I'm using all "A" track, except for the bumper at the end.
A track?
I don't own one, but from what I understood reading, there are two "types" of track with the trolley sets. One type contains the trigger to cause the reversing, the other is plain track. One "trigger track" must be on each end and I think they must have the letter on each facing the other track sections. There may also be a tutorial on YouTube. I would hunt for you, but must leave for holiday activities shortly. Good luck.