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.
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