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ShaunCN, Very nice question. I believe the F9's had head end power (Heat, Electricity etc) I believe they were in the A unit. However it is very common for most service to be providied by a A-A, A-B-A, or even A-B-B-A sometimes even more B units were added. Or you can take a unit A-B or A-B-B etc. The other thing to consider is "B" meant Booster. it did not have controls to be driven by itself. That is about all I can think of, good luck with your units. Lee
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