If operation is one direction,why not use 2 reed switches spaced at the opposite ends of the block powering the coils of 2 relays? First relay, DPDT latches through one of its own set of contacts and through the NC contacts of a second relay. The second relay unlatches the first. The second set of contacts of the first relay works the block signal. This way timer function is not needed and relay operation is based solely on train position. Could also maybe be done with a short insulated rail at each end but this may mess up the DCC signal.
Dale H
|
|
