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St Albans Abbey signal box diagram


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Can anyone help me with a picture of the Signal Box Diagram for St Albans Abbey station?  I've seen a low-res image of one on Sithlord's blog site, but I need the detail.  My immediate need is to work out the locking and hence the point rodding for the run-round.  I know there was a single lever ground frame, I have a couple of prints of photos of it that among a number that Joe Worrall gave me, taken by Alan Sibley in the 1960s.  I also know there was a gong and I believe this was mounted at the platform end, and there was a basic point lever controlling the switch between the regular run-round loop and the goods reception road.  I would assume that the ground frame was locked and unlocked from the signla box, with an intermediate lock midway from the box to the frame.  Published photos seem to show a single rod outside the run-round loop, but the station far end comprises three switches and two trap points.  Both the traps would have to sync with the platform road switch.

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