SN.22
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Origin
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Alterations in connection with Reversible Signalling
From 6 March 1977 the signal was mounted on a right-hand cantilever, in readiness for the future installation of SN.624R.
The reversible signalling was brought into use in 1981 [1].
Capability to flash double yellow
The signal was given the capability to flash double yellow in May 1988, when the next signal, SN.24, was showing a flashing single yellow, and the following signal SN.28, was cleared towards platform 3.
