John I am driving four motors using one DCDR and also with a TAS SAM board with good results I did beef up the sinks for the triacs and the bridge on both. The DCDR is in a Lionel 18953 Alco PA-1 which has Mabuchi 545 motors. Yeah I'm driving four of them with one DCDR. My brother has my layout in his basement and I left the Alco AA set there. He is not so restrained with the throttle as I am and has been pulling 12 Lionel NYC 72' cars with the AA Alcos for almost three years now so if anything was going to fry he would have found it. The TAS SAW board is in a MTH UP Veranda turbine he is just as heavy handed with it though he's only had it for about five months. So I know driving four motors on at least two different non cruise driver boards works. Now the question. I have four Cruise Commanders and have been going back and forth with whether or not to try what you have done on a MTH centipede AA but I was contemplating going to a 12A Bridge. Much of my hesitancy has been whether or not the curves, leakage, PIV etc of the new bridge must be an exact match, close match, or not to worry, with the original 8A bridge for the board to function properly. I am wondering if you gave a larger bridge some consideration when you broke it out and what factors swayed your decision to stay with the 8A bridge. My experience with MOSFET PWM drivers is limited but my impression is they are fussier than triacs . j
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