Dear Stan
Here what I mean the POT does not work correctly, either damage in transit or before. It does work as a waterfall as you stated. It does not work in my scheme because the length of the board is wider than the flat car, it will hit on coming train traffic with a board that long. I was hoping that would fit but for a dollar 1.27 all is not lost. If you do not try you will never know or learn anything. The new idea is to place all the electronics in box car for the MP player by the sliding door. The electronics for the Led circuit (Knight Rider)will go in the nose of the box car. There will be two tethers one from the Caboose powering the box car and all the electronics. The other tether would power the led (Knight Rider) on the flat car. It just got to crowd in the caboose with AC/DC buck, IR remote, its own led lighting, RED, led roof lights and red side led. It looked like NYC subway car at rush hour. The box car will have the MP player, amp, speaker, DC/DC step up for the Knight Rider circuit. It is better to fail and try again then never tried at all. It is all part of the learning curve. Thank you for your patients, guidance and advise.
