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Thanks.  Yes, that is the system of wiring I used with those wipers.  Each has a soldered lead up to the interior so the pick up is from all four axles and splitting the wipers allowed me to pick up from each track on each truck. I found now that the problem is just one of too much play in the wheel sets and a typical (cheap) plastic freight truck as compared to a loco.  I got good results by taping the flat steel weights from 6 freight cars on the top of the test car for experiement.  The contact is almost flawless in this test.  I thought about this when I noticed I could the Soundbug to work properly when I simply pushed down on the car at any time. However, such a weighted car is not practical and I will be trying some of those nice caboose trucks with pickups soon. Speaking of bridge rectifiers and caps, I see I had previously bought a selection of rectifiers ranging from 1.4 amp to 5 amp.  However I am not sure that the rectifiers and caps can be successfully added to a soundbug.....although it has circuit connections to a typical 8 pin connector originally intended to mate with the Digitrax decoder in the designed use.  I will have to do the research again on where to put rectifiers and caps in a decoder wiring setup.
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