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Rob McCrain describes the SHS signal circuit on his Farland Howe N scale layout
in this video.
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Station Signal Control for Model Railways
Azatrax SHS control circuit
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One SHS circuit operates starter, home and distant signals on one track at a model railway station.
Signal operation follows typical UK railway practice and of railways that derived their operations from the British, such as Australia
and New Zealand.
Infrared (IR) train detection eliminates the need for insulated rail gaps and
resistor wheel sets.
Signal installation for 1-way rail traffic
Signal installation for 2-way rail traffic
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Station signal operation with the Azatrax SHS:
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1. When the station is clear, distant and home signals show green and the starter signal is red.
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2. The locomotive trips the approach sensor. Distant signal changes to yellow, home signal changes to red.
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3. After the end of the train clears the approach sensor, a timer on the SHS circuit starts running. The train is expected to stop for the
red starter signal.
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4. Once the timer expires (20 or 40 seconds, user selectable) the starter signal changes to green.
A push button or toggle switch may be used to clear the starter signal early, or to hold it red indefinitely
(switches not included).
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5. The train leaves the station. When the locomotive trips the departure sensor, the starter
signal changes to red.
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6. Five seconds after the end of the train clears the departure sensor, the distant and home signals
change to green.
The next train is cleared to enter the station.
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© copyright 2009-2020 Azatrax LLC, Longmont, Colorado
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