Album: IAIS - 27/28 Dec 2006

When a train approaches, they key up the radio and enter a code sequence. The switch responds over the radio, reporting its alignment, and also clears the signal heads - all of them go green, no matter which way the switch is lined.
By: NDHolmes

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When a train approaches, they key up the radio and enter a code sequence. The switch responds over the radio, reporting its alignment, and also clears the signal heads - all of them go green, no matter which way the switch is lined.
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