SN.D4

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Origin

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Removal of Auto Plate

The WON, in February 1987, claimed that SN.D4 had been converted to a controlled signal.

However, it is probable that the signal continued to be an automatic in terms of its technical operation, albeit fitted with an emergency replacement switch, and the removal of the auto-plate was simply for the benefit of drivers treating it as a controlled signal. (This possibly had something to do with Hullavington Ground Frame in the section ahead?)

Conversion back to automatic

The signal was shown as being converted from a semi-auto (which is more appropriate that the 'controlled' classification it was given, above, in connection with the closure of Hullavington Ground Frame in July 1993:

In later years, despite the auto-plate being re-applied to SN.D4, the box instructions at Swindon continued to claim it was plated as a controlled signal.