DM.81

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Origin

The signal was brought into use in December 1977.

[The WON entry shows that the signal replacing SN.60, but as SN.60 had a different number and a different position, this is being treated as a separate signal.]

The signal was given the capability to flash single yellow when the next signal, SN.62, was displaying proceed with the route set towards the Down Badminton, in May 1979.