A decision was made by the SRR Board (me) that train carriages and locos on the SRR will be connected by 12mm, 6 pin plug/socket with multi-strand 6 core security system cable.The cable is really data cable but should easily carry enough current for led lighting and relay coils. The pin connections are rated more than 5A.
This will be the electric brake actuator for carriage #2, activated by microswitch on the mechanical brake, and a relay. It's a 24v push solenoid 20kg at 10A, 50% duty cycle
