Let's start with some clarifications. First, what is the overall size of your layout? Second, what exactly is a Cab-a? Did you mean Cab-1 (the TMCC controller)? What kind of command bases are you talking about? (It's kind of unusual to have 3 bases with just 1 controller. Once this is known (perhaps by including product numbers for each item) more accurate help will be forthcoming.
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