- Published in issue 12/1999 on page 0
Railway barrier monitor
The rails and wheels of railway carriages are liable to oxidizing no matter how carefully they are maintained. After a while this causes problems when the train moves across a level crossing since the oxidization causes unreliable contacts of the relevant switches so that correct and timely closing of the barrier (lifting boom or traditional gate) does not take place. As long as the switch contacts are sound, the barrier closes rapidly and timely. This is ensured by the circuit in the diagram, which may be used with a variety of model railway systems.