Lakeside Station signal box

Lakeside Station signal box with its Westinghouse Brake & Signal Co. Ltd. Style 'L' Power Lever Frame has a 35 lever frame that was part of the original Gloucester Road Junction signalbox which had 131 levers and was in use from 1955 until 1983. The frame was obtained and installed in 1986/7. The Signal Box is equipped as far as possible as the old Southern Region signal box would have looked in around the 1960's.

Lakeside signal box is now used to control and operate the Swanley New Barn Park miniature railway. This true to scale live steam miniature railway is located at Swanley, north Kent near to the M25.

The frame shown there is that which was located on the Central line and the siding was located between Holborn and Tottenham Court Road on the site of the closed British Museum station

Swanley

Above is an exterior photograph of the signalbox at Lakeside Terminus at Swanley New Barn Park miniature railway. Photograph © Mark Adlington.

The frame is a Westinghouse Style 'L' Power Frame which is all electrically locked. The frame was formed of 3 x 12 way section which making a total of 35 levers, {3x12}-1 = 35 levers, as the last “lever” space is unavailable. 8 of these levers worked the points, 15 signal levers operated the coloured light signals, with 6 spare levers when the frame was supplied and installed. This made the working lever total of 23.

Lakeside

The Westinghouse Brake & 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 top indicator behind the signal lever is the "F" light and this became lit when the lever was normal, all points in the route correctly detected and all relevant track circuits clear. You could pull the lever at any time provided that the locking was correct but the signal would not clear unless the "F" light was lit before the lever was pulled.

The following information {and photograph above} is taken from the Swanley New Barn Railway web site and is copied 'as is'. It is reproduced with full copyright acknowledgement to SNBR for both the interior photograph and the follow text..

Lever Frame
The signal frame is one of the few Westinghouse Type L still in operation and the 35 lever frame was originally part of the Gloucester Road (Croydon) box installation. The levers are fully interlocked with the point detection and track circuits. Unlike the original installation the interlock logic is not performed by interconnecting the lever switches (D-bands) and external relays, but a custom built micro-computer is used and the logic performed by a program stored on an EPROM. The lever positions, point detection and track circuits are used as inputs, and outputs from the computer drive the interlock solenoids, point motor relays, signals and the track diagram. With the exception of the signals, which use a low voltage AC supply, all systems run from a constantly charged 12v car battery. Although not really in keeping with railway tradition, doing it this way means that the system can be easily updated to meet changing track layouts. The design also has two totally automatic modes of operation built-in which enables the railway to function in the absence of a signalman.

Signals
The majority of signals are built using commercial vehicle marker lamp housings running from a 12v AC supply. The approach signal to the station complex is fitted with 12v 20w dichroic bulbs giving visibility of over 100 meters, even on sunny days. The signal at New Barn Halt (400m from the box) is supplied with 110v from a standard industrial safety transformer. All are operated by solid state switches in the box.

Points
The points are operated by car windscreen motors modified to give 2 stop positions. They are contolled by relays driven by the box computer. The car battery is used to absorb the high motor currents. The point position is detected by microswitches directly operated by the blade tie bar.

Track circuits
Unlike full size practice the track circuits are 'single ended' with one rail permanently connected to ground. The other rail is fed with 12v DC through a resistor and the voltage on that rail monitored electronically. The monitor circuit is designed to deal with the intermittent rail-wheel contact and the leakage caused by wet sleepers.


Diagrams

none availiable.

Adjacent boxes

there are no other signal boxes on the railway.