3-rail DCC is certainly doable and convenient, aside from the need for rework of one's locomotive inventory. AC-powered Blunami loco conversions coexist with TMCC and DCS, but the complication is designing/building a proper AC>DC converter to reside within the locomotive and the current ratings of the Blunami cards. Working on writing my guide to that interfacing.
As pointed out in a previous post, AC/DC converters are quite simple and have been used a number of times. The only relatively new control product that could be powered by either AC or DC was the recently introduced BlueRailDCC by BlueRailTrains in both 2A and 5A versions.
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