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Signal Fact 33

Somersault sempahore signals, centre balanced, were developed as a response to the Abbots Ripton collision of 1876 when snow had interfered with the correct operation of slotted post signals.

They were adopted by the Great Northern Railway, Belfast & Northern Counties Railway and Midland & Great Northern Joint Railway among a few others, including Australia.

South Wales Mineral Railway

This page should be regarded as “Work in Progress”. The webmaster will welcome additional information for this page.

In the list below the information is set out in tabular form, spread over four columns. The column entries are -

RailRef	The Line Code used in RailRef system.
Line Detail	The principal locations included within the Line Code. They are arranged in 'down' direction order. Locations shown are primarily stations and junctions to allow easy cross check against published atlases. Signal box names appear in italics where these are 'intermediate' to stations or have been shown to facilitate links from other pages on this web site. The inclusion of a station or junction name does not imply that there was always a signal box of that same name!
SBR	The section reference used in the relevant Signal Box Register published by the Society.
ELR	The corresponding Engineer's Line Reference(s). This will be blank for railways that never came within British Railways terms of reference. It will also be blank where British Railways had no surviving responsibility for infrastructure at the time the ELR system came into use.

RailRef	Line Detail	SBR	ELR
SL001	Glyncorrwg - Briton Ferry datum Waterloo Dock Junction 13m03c colliery/SWMR boundary 12m67c North Rhondda Colliery Halt 12m50c Glyncorrwg South Pit Halt 11m54c Glyncorrwg 11m50c Glycorrrwg Junction 10m38c Nantewlaeth Colliery Halt 9m45c Cymmer (1) 9m40c Cymmer Junction GW570 8m66c Abercregan Siding 8m51c Corrwg Vale Siding SL002 6m70c South Wales Mineral Branch Junction RS004 5m51c Tonmawr East Junction PT002c 5m41c Tonmawr 5m31c Tonmawr West Junction 5m19c Tonmawr Junction PT003 5m14c Blaenavon Junction SL003 4m74c Blaenavon Loop Junction SL004 4m66c Tonygregos Quarry 4m40c Aber Rhondda Colliery 3m13c Bwlch Colliery 2m44c Ynysdavid 2m51c Crythan Platform (Ynysmaerdy incline) 0m55c Neath Harbour Junction SL005 RS022c (1) Cymmer (Corrwg) from 1926 SMI: throughout SWJ: Tonmawr East Junction - Tonmawr Junction	Q5	SMI SWJ
SL002	Afan Vale Quarrys Branch datum Corrwg Vale end of line Corrwg Vale Siding SL001
SL003	Blaenavon Branch datum Blaenavon Junction Blaenavon Colliery closed by 1890.
SL004	Blaenavon Loop datum 0m19c Blaenavon Loop Junction PT004 0m00c Blaenavon Loop Junction SL001		BOZ
SL005	Briton Ferry Goods Lines 0m00c junction from Port Wallaroo Dock Line 0m55c Neath Harbour Junction SL001 RS022c 0m65c end of line		PTZ

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