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Not sure if this will work for your repowering needs but I kitbash 'gas electrics' using modified Spectrum heavyweight pass. cars powered by power trucks from the Spectrum GE 44 tonner diesels. The 44 tonners have two powered 4 wheel trucks each with a separate motor and drive connected thru a printed circuit board for providing power to the lights in the unit. I'm not sure of anything else? the circuit board is used for. . . These power trucks are VERY compact-the motor sits directly over the truck and the drive gears are directly connected to the motor shaft. Consequently, they are easy to conceal in a car body, at least in a 'combination' type car I use for my application. Although one could power both trucks in a particular car by connecting jumpers between the trucks and the circuit board (due to the much longer wheelbase of the new application, I have found that one power truck works just fine and will pull two typical 'gas electric' trailers up a 2% grade provided that only minimal extra weight is added to all three units. I run jumpers to the rear truck of the 'gas electric' powered unit and employ wipers to metal axles (insulated side to side) with metal wheels for eight wheel pickup. I've also used a thin brass shim-like arrangement behind the side frames of the rear truck to pickup power. For all trucks, other than the powered truck, I use slightly modified MDC Roundhouse 4 wheel pullman trucks-should be still available. The same trucks' sideframes are easily installed on the GE 44 tonner trucks. A similar swap may work for your application. As a side note, with only one truck powered, my gas electrics perform very protypically-they're a liitle underpowered!
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