SN.653

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Origin

The signal was brought into use over the weekend 3-5 May 1977, replacing ground position light signal SN.209 as part of the preparation for the commissioning of reversible signalling.

SN.653 was fixed at red initially.

1977-11.png

The reversible signalling was brought into use in 1980 [1].

References

  1. ↑ Signalling Notice 31/2767
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