The NJ International Simple Signal Circuit is a control circuit and logic board for signal control on standard DC, DCC and AC-powered railroads. It's set up for single-track, bi-directional operation and uses self-adjusting optical sensors (sold separately). It operates all types of common-anode signals. Simple Signal Circuits can be "daisy chained" to create a larger signaling system and the boards have interlocking features for dual-head signals.
Realistic prototype operation, bi-directional indication, block occupancy indication to control panel, reverse loop operation, no track gaps required.