Very nice. Sounds like these modifications will completely transform the character of the RDCs, and make them much more fun and interesting to run.
Of particular interest to me was that the AC Commander provides very good low speed operation, and presumably smooth operation throughout its range, with the 100 speed steps. I wonder if an AC Commander installed in place of the factory-installed TMCC unit in, say, a F-3, or a Geep, would be worth it with respect to improvements in operating characteristics. Obviously a matter of individual judgement, but would the improvement be significant enough to justify the cost?
When I was doing my two-motor upgrade of the Phantom, I replaced the LCRU with the AC Commander. The difference in low speed performance was quite simply amazing. I don't know if it's the 100 speed steps, or just better regulation on the driving voltage, but it really does change the operation for the better. Since these are pretty light, and they won't be pulling anything else, even varying track voltage didn't seem to affect the speed all that much. I was quite pleased with the performance.
John, what sound set did you use? Back when Jon was starting out he had a Sound Commander for the RDCs along with a Buddy Commander cousin to the Beep Commander. Perfect for the single motored Williams RDC. The RDC Sound Commander has a very nice two chime horn. You could also order a single chime. Keep an eye out for them in case they should pop up.
Pete, I gave the customer his choice, he picked the ERR C420 sound set. I suggested that or the Alco PA, the only two that appear to be normally aspirated diesels, I figured those would be as close as we can get. I actually looked for a RS4 board on Lionel that would be closer, but I found zilch. I know about the Sound Commanders, I have a couple, but none of the RDC ones. It's really not practical to sit on an upgrade for months, or more, hoping something like that will come along.
IF the motors ran smoothly in the first place (i.e., well broken in, or early Postwar quality and not some of the recent Chinese imports); and ESPECIALLY if at least two motors are being controlled (i.e., dual-motor F-3s or two powered geeps MU'd together) I would rate them better than modern dual-motored diesels for realistic start-up and slow speed operation.
Well, IMO now you're getting carried away! A modern Legacy dual-motored diesel will move out very smoothly and very slowly. It will also do so silently so that the sound set is all the sounds you hear. FWIW, I suspect this was one of those cheap motors you complained about.