Severn Bridge Junction signal box's Up & Down Platform line starting signals at the south end of platform 4 at Shrewsbury station. Monday 27th August 2007
Severn Bridge Junction signal box is located within the triangle of lines at the south end of Shrewsbury station, and is a London and North Western Railway type 4 design which was opened in June 1903 for the London and North Western and and Great Western Joint railway fitted with a 180 lever London and North Western Railway Tumbler frame, replacing an earlier box. The original bar and stud locking was replaced by Great Western Railway 5-bar tappet locking in 1952. And the signal box was listed as a Grade II listed building on 23rd January 1991
(Left to right) 26 signal (up & down platform line home to Wellington) and 20 signal (up & down platform line home to Hereford) are carried on a British Railways London Midland Region two doll balanced bracket on a tubular main stem which replaced a London and North Western Railway two doll balanced bracket signal latterly carrying Great Western Railway lower quadrant arms with a Great Western Railway calling on arms beneath them (27 beneath 26 signal, and 21 beneath 20 signal) in the early 1980s
The white diamond indicates to the driver that his train is occupying a track circuit that indicates his presence to the signalman
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