SN.70
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[There have been two SN.70s - an early one relating to DM.89 and the later one relating to SN.72R on the end of Chippenham station.]
Conversion from automatic
This signal was made controlled and re-designated from DM.89 in December 1970:
AWS Fitment
The signal was fitted with an AWS ramp in October 1971.
Origins of NEW SN.70
SN.72R was renumbered to SN.70 after 1975.