Bill, I disagree, with the exception of high end brass models most production 2 rail Models these days have the same drive as the 3 rail. The motors are no different. The difference is the control system and DCC has different wiring requirements than TMCC/Legacy or DCS. DCC is a much better system in my opinion and is designed to follow a standard, is universally compatible and specifically suited to running large to very large model railroads. When building large layouts there are certain criteria that need to be met for either 2 rail or 3 rail and wiring is complicated on either camp. I do not think that a smaller rail profile has anything to do with conductivity or current flow and it most certainly does not have any mechanical deficiencies. Track is track and if you do it right it'll be trouble free for life, do it wrong and you'll wish you took the time to do it right
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