@BOB WALKER posted:Need clarification. Is it correct to assume that for gateway control of conventional locos with the CAB-2 controller, the loco must be retrofitted with a bluetooth control board?
Yes whether it's fully custom driver or an R2LC pin compatible module, a Bluetooth board of some description would be needed. If blessed(nice word for licensed) by Lionel it could be LC. Otherwise a from scratch LC Gateway proprietary signal. At that point though, might as well go ERR TMCC unless Bluetooth or LC remote is the goal. In which case I wouldn't blame you. I like LC too!