Post by mrfs42 on Dec 5, 2008 13:59:36 GMT
Before I finally pack away the A4 parts of the library, I came across some notes about the GN&C signalling - I've got a drawing from Raynar Wilson's 'Power Railway Signalling' (1908) and a list of signal numbers from the 1921 Met. Appendix to the WTT.
One thing that is puzzling me - even after following the wiring diagrams in Raynar Wilson is a comment in the lever list for Moorgate:
Inbetween the Raynar Wilson listing and the Met. Appendix there were calling on signals installed at both Finsbury Park and Moorgate; I can account for those.
My puzzlement stems from the 'Buffer Bolt Lock'. Were there long run-off 'sidings' at Moorgate, in effect like Charing Cross (Jub) and Walthamstow? Because of the era under discussion, the signalling was of a different style. Would it seem reasonable to suggest that the was room beyond the platform (perhaps on both roads) to stable a set? I know that in 'The Big Tube' JGB states that these over-runs were unable to accommodate full-length trains - could these have held an additional car?
Looking at the gradient profiles, at Finsbury Park, there was a 1 in 50 fall to the bufferstops, so this 'buffer bolt lock' - which I think is a euphemism for a 'rail stop' wouldn't be needed - at Moorgate the track is level, so a rail stop would be belt-and-braces.
There is another remote possiblilty, bearing in mind that the Raynar Wilson diagram dates from 1908, that the railstop protects the extension southwards to Lothbury and the Bank of England. THis extension was started in 1902, and not formally abandoned until 1909.
Any thoughts out there?
One thing that is puzzling me - even after following the wiring diagrams in Raynar Wilson is a comment in the lever list for Moorgate:
Apparatus:
5 signals, 2 repeated
2 levers for points
3 levers for facing point locks
1 lever for Buffer Bolt Lock
2 spare levers
Total = 13
Inbetween the Raynar Wilson listing and the Met. Appendix there were calling on signals installed at both Finsbury Park and Moorgate; I can account for those.
My puzzlement stems from the 'Buffer Bolt Lock'. Were there long run-off 'sidings' at Moorgate, in effect like Charing Cross (Jub) and Walthamstow? Because of the era under discussion, the signalling was of a different style. Would it seem reasonable to suggest that the was room beyond the platform (perhaps on both roads) to stable a set? I know that in 'The Big Tube' JGB states that these over-runs were unable to accommodate full-length trains - could these have held an additional car?
Looking at the gradient profiles, at Finsbury Park, there was a 1 in 50 fall to the bufferstops, so this 'buffer bolt lock' - which I think is a euphemism for a 'rail stop' wouldn't be needed - at Moorgate the track is level, so a rail stop would be belt-and-braces.
There is another remote possiblilty, bearing in mind that the Raynar Wilson diagram dates from 1908, that the railstop protects the extension southwards to Lothbury and the Bank of England. THis extension was started in 1902, and not formally abandoned until 1909.
Any thoughts out there?
