UM.79
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Origin
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Alterations in connection with Reversible Signalling
From 6 November 1977 the signal was mounted on a new gantry, in readiness for the future installation of SN.653R and DM.79 on the same structure.
The reversible signalling was brought into use in 1980 [1].
Capability to flash double yellow
The signal was given the capability to flash double yellow in May 1988, when the next signal, SN.53, was showing a flashing single yellow, and the following signal SN.59, was cleared towards platform 3 or platform 1.
