UM.73
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Origin
UM.73 was a 3-aspect automatic signal commissioned at Swindon MAS Stage 1 on 14 November 1966[1]. At that stage it was supervised by Highworth Junction SB. It was the first colour light stop signal on the Up Main in the new set of track circuit block sections that had been installed between Highworth Junction and Uffington SBs.
It had its own repeater, UM.73R (which eventually became UM.75 under Swindon MAS Stage 5).
| Previous Signal | Line | Line | Next Signal |
|---|---|---|---|
| Highworth's Up Main Starting (Semaphore) | Up Main | Up Main | UM.72 |
| Highworth's Up Goods Loop Starting (Semaphore) | Up Goods Loop | ||
| Highworth's Up Siding Starting (Semaphore) | Up Siding |
Supervision of UM.73 passed to Swindon Panel under Swindon MAS Stage 5 on 3rd March 1968.
| Previous Signal | Line | Line | Next Signal |
|---|---|---|---|
| UM.75 | Up Main | Up Main | UM.72 |
When reversible signalling was installed in 1980 UM.73 shared its cantilever structure with SN.683R[2], which later became SN.681[3].