North West Short Line offers a number of power drive-units in their catalogue, including ones for re-powering a variety of manufacturers' locos. My catalogue is an older one, but it shows at least one power truck made specifically for an Athearn RDC.
Wayne
Remove the guts, turn them into dummies, and couple them to a Proto 1000 powered unit?
Don’t know about Bowser. Probably easier to call them and ask tomorrow.
However, there was an outfit called Ernst that made a re-gear set specifically for the Athearn RDC. Look in the Walthers on-line catalog for item 259-3. Out of stock but you’ll probably find one if you search.
Tried one of them once and didn’t have much luck. Probably not patient enough.
A few years ago I bought a pair of Athearn RDC units at a train show. The baggage/express unit was powered and the coach was dummy. A few months ago I opened up the powered unit to see what it would take to convert them to DCC and discovered it has a rubber band drive. I tried running it in DC mode and it had a herky-jerky movement to it. I'm thinking the best option would be to replace the motor and trucks but I've never done such a conversion and I'm wondering what might be a good replacement for what is in the powered unit.
I clicked on the Bowser ad at the top of this page because it showed such a motor and trucks but all it did was take me to their home page and I can't find the item that was in the ad.