MRC Control Master 20 Replacement - Walk Around Throttle 

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I am interested in this system please share more info and videos.

You don't happen to fix the control master throttle controller do you? I have 2 units, iv narrowed it down to the hand held throttle as being bad..I plug in one remote and the trains run fine, I plug in the other and nothing, the direction work on it though as I can hear the relay switch over in the power box..and, the momentum light illuminates..but nothing from the pot ..