to stop automatically at designated points along the oval track for a specified period of time (say 10 seconds) and then automatically start rolling again to the next "trolley stop" to do the same thing. I would need a simple electronic device I could fashion from parts from an electronics store with design plans and diagrams or equipment that is ready-made that I could buy to do this task. There has to be a sensor/trigger device on the track that knows when the trolley is at the stopping point and the device has to cut off power to the transformer for a certain amount of time and then power the transformer back on again after the time has passed to make the trolley move again. This would give my trolley continuous stop-and-go action. Something like this could also work for electric trains as around a Christmas tree. I have scale trolley stops with people figures at them but have to manually control the trolley at the transformer to stop. It would be a lot more fun if the trolley (the 2000 Garland Holiday Town Transit No. 7) could be made to stop-and-go regularly by itself and stop at designated positions on the layout.

As an added bonus, I would like a way of hearing a trolley "bell" ring when the trolley arrives at the stop and ring again just before the trolley takes off again.

Add this too http://z-stuff.net/dz1240.html and http://z-stuff.net/dz1205.html. Just don't us the reverse or if is like my trains just switch it to forward only. You will have to use the Sensors to stop it if you want it to stop at the same place every time. If you just want it to start and stop and don't care where just us a timer.
GB Johnny333 65+++