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I have dozens of DCDRs removed for Cruise upgrades but zero ACDRs. I am wondering if they both use the same power devices? I am thinking if they do I might try removing the bridge rectifier to make the DCDR work for a Pullmor. Anyone try this? Also not sure if the extra opto isolators will be a problem.

Pete

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Good question Pete.  I think it would probably be necessary to reverse engineer the two and develop a schematic as a first step to see what changes would be required.  They use different triacs, but they have similar specifications, they're 8A parts.

Truthfully, I think I'd just reverse engineer the ACDR and make a new PCB.  Looking at the circuits on each, it looks like enough hacking/whacking that it would be easier to just make one, YMMV

The 691-PCB1-021 ACDR is also still available from Lionel parts, if you wait for the end of year sale, they're only $20/ea.

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