chris a posted:My question Stan: I am not sure whether I need 11 relays and 11 signals or 12 relays for the 11 blocks/11 signals. My blocks are alpha labeled A through K... when the train leaves K it enters A ( continuous loop)....
I think I understand your question. If you have 11 blocks and 11 signals in a continuous loop then you only need 11 relays. They must all be of the 3PDT ilk. That is, in the diagram each signal is wired to 2 poles of its "local" relay and 1 pole of the "next" block's relay. In your example, for block K, the "next" block is block A.