London Bridge signal box

London Bridge was opened by the Southern Railway on 17th June 1928. It was an non standard 3 story all-brick structure built to a similar outline as the Southern Railway Type 11 and 12 designs, and was fitted with a 311 lever Westinghouse Brake & Saxby Signal Co. Ltd. Style 'K' style frame.

On the 19th Aril 1969 the Brighton Bell was an unusual visitor having been diverted from Victoria.The coloured light signals are visible. The lever frame controlled 216 signals, and 79 sets of points, also provided were 2 illuminated track diagrams. London Bridge was and still is a terminus station with 4 through tacks to Cannon Street and Charing Cross stations. To open a separate aerial view of London Bridge station use this link

The signal box was closed on 19th April 1976 when signalling of the area was taken over by London Bridge Area Signal Center.

London Bridge signal box taken in 1969, with its Westinghouse Brake and Signal Co. Ltd miniature power lever frame

The frame is a Westinghouse Style 'K' Power Frame which was mechanically interlocked. The weight of the London Bridge lever frame weighing in at 23 tons for its 311 levers. This kind of weight at 23 tons needed a very strong mechanical support for the lever frame itself to ensure that the frame did not twist or become mis-aligned at any time so that the mechanical lever locking could never be compromised and cause what is know quoloqly as a wrong side failure. Most of the mechanical locking was supported and maintained in the interlocking room on the floor immediately below the lever frame. Picture copyright J Scrace, reproduced by kind permission of Middleton Press, from their London Bridge to Addiscome book in the London suburban railways series published in 1993 ISBN 1873793200

London Bridge's Westinghouse Style 'K' Power Frame being constructed in Westinghouses Chippenham signal works in 1927 picture 1.

A 1928 view showing the installation of the interlocking lever frame for the 311 levers, the signal current was 110v AC and the point motors were supplied at 130v DC from accumulators charged by motor generators powered by the 650v DC traction current. Picture from the Railway Engineer, reproduced by kind permission of Middleton Press, from their London Bridge to Addiscome book in the London suburban railways series published in 1993 ISBN 1873793200

London Bridge's Westinghouse Style 'K' Power Frame being constructed in Westinghouses Chippenham signal works in 1927 picture 2

Another view of the frame being assembled in the Westinghouse's Chippenham factory.

London Bridge signal box internior taken in 1950's, with its Westinghouse Brake and Signal Co. Ltd miniature power lever frame, notice the Walker Rotary Train describer, photograph 1

The Westinghouse Brake & Saxby Signal Co. Ltd lever frame, with its indicators behind the levers, the 4 glass roundels showed the signal aspect, being Red, Yellow, Green & 2nd Yellow reading from bottom to top. The The Walkers Rotary train describers sending boxes are fitted on top of the frame box whilst the receiving train describer units are housed between the signalling diagrams. The London End of the frame only had a limited number of The Walkers Rotary train describers are only 4 platform lines carrying onto Borough Market Junction Signalbox area. The desk for train recording is situated in the immediate front area.

London Bridge signal box internior taken in 1950's, with its Westinghouse Brake and Signal Co. Ltd miniature power lever frame, notice the Walker Rotary Train describer, photograph 2This time the view is from the high end numbers with the last lever numbered 311. Notice the 5 signalmen on duty at the lever frame. This is the County end of the frame hence lots of the Walkers Rotary train describers are present.

London Bridge signal box internior taken in 1950's, with its Westinghouse Brake and Signal Co. Ltd miniature power lever frame, notice the Walker Rotary Train describer, cigarette card 1 Interior of the all electric signal box at London Bridge station, Southern Railway from the cigarette card. Clearly taken from the photgraph above. The rear of the card states it is of Brighton signal box, however it's clearly the interior of London Bridge signal box. The best guess is that Southern Railway publicity department wanted a signal box interior, and the available picture was of London Bridge, so London Bridge was used for the Brighton signal box picture.

Diagrams

Attached is Southern Railway signal instruction 20 notice of 1928 and signal instruction 20 track diagram of 1928 ) for London Bridge signalbox, this covers the London Bridge track layout. These diagram(s) are taken from the website of the Signalling Record Society Research Note37. These images are copyright of the Signalling Record Society, and reproduced by permission.

Adjacent boxes

London Bridge to Brighton (Main & Local Lines ) Southbound

Bricklayers Arms Junction signal box was the adjacent signalbox.

London Bridge to Dover Marine (via Tonbridge) SECR line

To the South, Spa Road signal box was the adjacent box, Spa Road signal box was closed on 1st December 1929 and North Kent East Junction signal box (2m 539yds away) became the adjacent box until closure

Bricklayers Arms to North Kent East Junction LBSCR line

Bricklayers Arms Junction signal box was replaced by a new box (1m 1675yds away) on 8th October 1950. Bricklayers Arms Junction signal box was closed on 20th July 1975 and London Bridge PSB became the adjacent box.

London Bridge to Cannon Street & Blackfrairs station lines

To the North, Borough Market Junction signal box (642yds away) was the adjacent box until closure.

London Bridge to Victoria (South London Lines )

Peckham Rye "C" was the next adjacent box. Peckham Rye "C" box was closed on 13/04/1969 when the box was replaced by a panel installed in Bricklayers Arms Junction.