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S&DJR Signals
S&DJR Crest Somerset & Dorset Joint Railway
The Signals
S&DJR Crest
Introduction Signal Posts Finials Signal Arms Subsidiary Signals Wrong-Road Signals Ground Signals Electric Signals

Introduction

This page provides general information about the different types of Signals on the Somerset & Dorset Joint Railway (S&DJR). Specific details on individual S&DJR signals are contained within a separate Register of S&DJR Signals.

Information about the earliest forms of signals on the S&DJR (and its predecessor companies) appears to be virtually non-existent. It has been suggested that the Somerset Central Railway (SCR) used disc-and-crossbar signals similar to those of the Bristol & Exeter Railway, whilst the Dorset Central Railway (DCR) used disc signals similar to those of the London & South Western Railway (L&SWR). Although that would seem to be a reasonable theory, there is no known evidence for the use of the L&SWR style. The Somerset & Dorset Railway Rule Book of 1864 contains illustrations of the disc-and-crossbar type only and there are references to that type on the old DCR at Wincanton in some 1870s plans, whilst one example existed at Spetisbury until 1901 (although, of course, it may have been moved there from elsewhere).

The familiar semaphore signal probably first arrived on the S&DJR in large numbers with the opening of the Bath Extension in 1874 and the rest of this page deals with the subsequent period. The S&DJR Officers Minutes for 21-October-1875 stated "...all disc-and-crossbar signals to be superseded by semaphores as renewal becomes necessary...". After the formation of the 'Joint' line in late 1875 the L&SWR assumed responsibility for its signalling, but although in later years there was much evidence of the influence of both the L&SWR and the subsequent Southern Railway (SR), nevertheless the S&DJR still managed to display its individuality. Some suitable illustrations can be found in "A Pictorial Record of Southern Signals" by GA Pryer [1] and are referenced in this page as 'PRSS'.

Bracket signals at Highbridge S&DJR station
A variety of S&DJR signals at Highbridge station in 1965
Two different patterns of ground-signal, two different types of signal post, and three different styles of finial !


Signal Posts

Three main materials were used for S&DJR signal posts:- wood, steel lattice and old rails. The Bath Extension probably was equipped throughout originally with wooden posts and it is likely that these were used for work elsewhere on the line in the 1870s and 1880s. Certainly wooden posts were still being used as late as 1892 in connection with the doubling of the line at Midford. However the metal lattice post appears to have come into use circa-1900 and this was identical to the L&SWR pattern (PRSS Fig 15). There were also two known examples of concrete posts (one at Glastonbury and the other at Evercreech Junction), both of them for signals which were first installed in December 1929; this seems too much of a coincidence not to assume that the concrete posts were the original posts at that time.

S&DJR rail-built post signalSignal posts constructed from old rails were a common sight on the Southern Railway (SR), but this method of construction was neither invented by, nor exclusive to, the SR. It is unclear exactly when or why the S&DJR started using rail-built posts, but they appear to have been in use by about 1905 and there is some circumstantial evidence to suggest that they were introduced in the 1890s. It is possible also that this type of construction may have been superseded prior to the 1923 Grouping, presumably by a return to lattice posts, as at least one S&DJR rail-built post is known to have been replaced by a lattice post prior to that date. Exactly when the SR introduced their own design of rail-built posts also seems unclear, but the first widespread use appears to have been on the Wimbledon-Sutton line in 1929 (when they were described as "a novel idea" - clearly the reporter had not been to the S&DJR!), so the SR pattern may have begun to appear on the S&DJR in the early 1930s.

The method of construction for rail-built posts varied between the two Companies. The S&DJR pattern normally consisted of two rails bolted tightly together (see picture - click for larger image), so that at a distance they appeared to be a single rail and sometimes are described erroneously as such in photograph captions, even though the heads of the bolts holding together the two rails can be seen. Although the two-rail method provides better strength, it appears that a few short examples did have only a single rail. The SR type had two rails held about 9 inches apart by spacers in an elongated 'H' pattern. S&DJR-pattern posts were erected with the rail web at right-angles to the track, while the SR type had the rail web parallel to the track.

Most S&DJR bracket signals had the 'dolls' standing up above the actual bracket, but there were also examples of 'gallows' signals where the dolls were suspended below the bracket (eg West Pennard and Wells). For rail-built bracket signals the S&DJR design appears to have been essentially a straight rail-built post with a frabricated bracket attached to it. It has been suggested that the dolls may have been only single rails - possible because of their short length or the need to reduce weight on the bracket - but certainly one example is known to have had a two-rail doll. In the SR design the main post was often more substantial, with at least four rails, but the individual dolls were always lattice in order to reduce the weight. There was one known example (at Templecombe Junction) of a signal gantry which spanned the tracks and was supported on posts at both ends.

In 1960 two examples of British Railways (Western Region) tubular steel posts were erected at Midford, and another example was installed at Masbury by mid-1961. In March 1966 a short BR(WR) tubular doll was fitted to an existing SR rail-built bracket signal at Highbridge as part of the alterations to retain the line to Bason Bridge for milk traffic. It is possible that there may have been other BR(WR) tubular post installations which have not been identified as such because they escaped the photographic record (one potential example being the Down Distant at Wincanton, which was renewed in 1960).

Note: The information given above may seem to imply a chronological progression in signal post style from wood through lattice and S&DJR rail-built to SR rail-built. While this is probably roughly true, the type of post used is not necessarily an accurate indicator for the age of any signal. For example, in the 1940s there were two separate instances when both lattice and SR rail-built posts are believed to have been installed at the same station on the same day! It was probably the case that, for economy purposes, the signal department simply re-used whatever material it might have available as much as possible, rather than always providing the 'latest type' of post. In addition, the actual distribution of the S&DJR style of rail-built posts across the whole of the S&DJR is something of a puzzle; although they were used in many places on the Bath Extension and the various Branches, only two examples (one at Shillingstone and the other at Corfe Mullen Junction) are known to have existed south of Templecombe Junction.


Signal Finials

S&DJR-style signal post finialMost, if not all, of the wooden signal posts appeared to have been fitted with a 'ball-and-spike' pattern of finial. A few examples could be found also on lattice posts, but generally the latter used an open cruciform style that had been adopted by the L&SWR (PRSS Fig 15). The S&DJR-pattern rail-post signals had a cruciform version of the ball-and-spike finial, of which at least two designs are known. It would appear that the earlier rail-post finials were cast, whereas the later ones were fabricated, and it is probable that the latter process led to variances in the design. (The photograph shows a fabricated S&DJR finial now in the Radstock Museum which come from a S&DJR-pattern rail-built post on the Clandown Branch; click the picture for a larger image.) There were differences also in the fixing arrangements, as some surviving finials have a single bracket projecting from the bottom for fixing to the rails, whilst others have a pair of brackets. The SR pattern of rail-built posts had a low pyramid-shaped finial, while the few BR(WR) tubular posts used the standard BR(WR) form of 'open' ball-and-spike finial. The concrete posts appear to have had no finial at all, but were merely manufactured with a pyramid-shaped top.

Although it might appear that, in general, the type of finial was dependant upon the nature of the post to which it was fitted, it would seem that the S&DJR was not averse to using whatever came to hand. For example at Highbridge there is photographic evidence that, in addition to the 'usual' patterns of finial, there were two examples of a Dutton 'spear-point' finial and also an 'open-ball' finial of a style more commonly seen on signals in Scotland! Two more Dutton 'spear-head' finials were fitted to a bracket signal at West Pennard. (One may speculate that the Dutton finials could have been relics from the original Dutton installation for the Bridgwater Branch, but alternatively they may have originated from elsewhere on the L&SWR.) One signal at Bason Bridge had an Evans O'Donnell 'arrow-head' finial, similar to those used initially on the Lynton & Barnstaple Railway. It was not unknown also for two dolls on a bracket signal to have different styles of finial. Needless to say, with the passage of time some finials became damaged and others disappeared altogether.

The painting scheme for S&DJR finials has been a matter of much debate and perhaps is best described as 'unclear'! Research into anything pre-1950 has to rely mainly on black-and-white photographs, where it is difficult often to tell whether an area of dark colour is black or red paint, or just the result of years of dirt and smoke accumulating on white paint. In theory both the L&SWR and SR painting schemes specified that finials should be painted all-white, but there is some evidence that elsewhere on the L&SWR the 'ball' or 'swell' part of some finials was painted red, whilst in later SR days there were many examples where the ball/swell or even the whole finial was a dark colour. Much of the difference perhaps can be put down to 'local variations' in both 'custom and practice' and the interpretation of the official painting schedules, such as whether a finial was part of the signal post (to be painted white) or part of the fittings (dark grey).

It is evident from colour photographs that post-1950 on the 'Somerset' part of the S&DJR it was common for the finials to be painted generally white, but with red (for stop signals) or yellow (for distant signals) on the ball/swell part. (In the case of SR rail-built posts, the whole 'cap' was painted in the relevant colour.) As this was standard practice on the Western Region, it had been thought that this use of red (or yellow) was simply a result of BR(WR) gaining control of the northern part of the railway during the 1950s, especially as the 'Dorset' part continued to show Southern Region influence with mostly all-white finials. However it may well be the case that BR(WR) in fact was simply perpetuating an existing S&DJR colour scheme, albeit perhaps with a greater degree of consistency across the railway.


Signal Arms

Signals arms consisted of a 'blade' attached to a metal spectacle plate casting. Signal blades were made from wood originally and the overall arm design was a lower-quadrant (LQ) pattern similar to that used by the L&SWR. Upper-quadrant (UQ) arms began to appear in SR days and these had metal blades, usually with distinctive horizontal corrugations which were provided to give greater strength to the sheet metal arm. (It is possible that some LQ arms were also fitted with metal blades.) It is not known exactly when or where the S&DJR started to use UQ arms, but evidence would suggest that LQ arms were still being fitted on new signals as late as 1929 (eg at West Pennard). UQ arms were used mainly on the SR-type rail-built posts and on lattice posts; a few examples were known on the S&DJR-type rail-built posts, and only one on a wooden post (at Midford). (The Midford example was the Down Starting signal (No 3), which was damaged in the 1936 'runaway train' accident. It is a possible theory therefore that the UQ arm was fitted when that signal was repaired, but this can not be proven.) LQ arms of the BR(WR) style were fitted to the few BR(WR) tubular post signals that were installed in the 1960s.

Note: Although it would appear that the SR type of rail-built signal post was not introduced until after the adoption of UQ arms, there were many examples elsewhere on the former Southern Railway where LQ arms were fitted to SR rail-built posts. It is possible that there was a transition period during which the SR was using up existing stocks of LQ fittings on its new type of post. On the S&DJR there were certainly a few known examples where LQ arms were fitted on SR rail-built posts, but most of their posts of that type had UQ arms.

Stop arms were painted red with a vertical white stripe on the front, white with a vertical black stripe on the rear. Spectacle plates originally displayed red and white aspects, but the white was replaced by green by about 1895. During the SR period a few examples appeared of stop arms which had a large black ring fixed to their front face. Although this style had been used extensively by the S&DJR for subsidiary arms, the use for main running signals was limited and confined to signals controlling movements to or from goods lines. All known S&DJR examples are listed in RailWest in a separate Register of Ringed Arms.

No specific information is available on the early style of distant arms but probably this followed the general British development. Originally identical to stop arms, from 1872 distant arms were distinguished by a V-notch cut in the end and later the vertical white stripe was replaced by a white chevron; the rear appears to have retained a stripe even when the front changed to a chevron. From about 1925/7 onwards all distant arms would have been re-painted in the new standard of yellow with a black chevron on the front and white with a black chevron on the rear. Spectacle plates originally displayed red and white aspects, but the white was replaced by green by about 1895 and eventually the red aspect was superseded by yellow at the same that the arms were repainted yellow.

Note: although not strictly of relevance to the S&DJR, it may be useful to mention here the Coligny-Welch indicator. This device, which was fitted to distant signals by some railway companies, showed an illuminated white chevron next to the main signal aspect as a mimic for the notched end of the distant arm. The L&SWR was fitting these indicators to its distant signals in the Wimborne and Poole areas in the early 1900s, yet curiously there is no evidence that they were ever used by the S&DJR. The only signal actually on S&DJR lines known to have been fitted was the Down Distant for Broadstone, which of course was a L&SWR signal-box anyway. Coligny-Welch indicators became superfluous and were removed when the red aspect on distant arms was changed to yellow.


Subsidiary Signals

S&DJR 'Calling On' and 'Shunt Ahead' signals took the form of a full-size arm painted red with a white spot, surmounted by a black ring, the reverse being painted white with a black spot (PRSS Plate 81). (Note: usually the S&DJR seems to have described all such signals simply as "Shunt By" signals, regardless of their function.) In the SR period a few appear to have been renewed as a LQ arm, painted red with a broad horizontal white band and bearing a large red 'C' or 'S' on their face; the reverse was painted white with a broad horizontal black band. In later years some were renewed as smaller UQ arms painted in the same style; some of these bore a large red 'S' on their face while others had an indicator attached to the post which, when the arm was 'off', showed an illuminated 'C', 'S' or 'W' to denote their function ("Calling On', 'Shunt Ahead' or 'Warning'). In such cases the main arm was renewed also as an UQ arm. All known examples are listed in RailWest in a separate Register of Ringed Arms.


Wrong-Road Signals

For 'wrong direction' movements over running lines a special 'wrong-road' signal was used which had a full-size arm in the shape of an elongated 'X', often referred to as a 'bow-tie' arm (PRSS Plate 83). This pattern of arm was peculiar to installations by the signalling contractors Stevens & Sons and was not unique to the S&DJR, but sadly it is often described incorrectly as such in many publications. Although the 'wrong road' signal is perhaps the most well-known feature of S&DJR signalling, only five examples are known to have existed on the line. More details about these signals can be found in a separate RailWest page.

Wrong-Road 'X'-arm signal  John Hinson

Ground Signals

The terms 'ground signal' or 'ground shunt signal' were commonly applied to small signals use primarily for shunting purposes. As their name implies, most 'ground signals' were indeed located on the ground, but examples could be found which were elevated for sighting purposes on a short post, or part of the way up the same post as a main running signal, or even up on the platform of a bracket signal. The alternative term 'disc signal' was used sometimes, even for ground signals which were not actually of a 'disc' form. Somewhat confusingly the term 'shunt signal' might be used for other forms of signals (eg the subsidiary arms) which were not regarded as ground signals.

The earliest form of ground signal was the 'point indicator' (sometimes called 'point disc'). This was located next to a point and connected directly to it, so that the 'signal' was operated by the actual movement of the point itself from normal to reverse or vice-versa. It is known that point indicators did exist at various locations on the S&DJR (they are marked on signal diagrams for places such as Ashcott, Cole and Shillingstone etc), but all known examples had been abolished by BR days and appear to have escaped photographic record. Consequently the style of S&DJR point indicators is unknown, although there is circumstancial evidence to suggest that the S&DJR may have used a version of Stevens 'flap' signals (see below) for this purpose. The flaw with point indicators was that they were not an 'independent' signal, in other words one that could be operated by the signalman by means of a separate lever; they only indicated the position of the point and not whether it was safe to shunt past it or not.

Stevens 'flap' ground-signal  John HinsonThe first known type of S&DJR 'independent' ground-signal was the Stevens 'flap' type (PRSS Plate 79). In the 'on' position these signals displayed a large red-painted 'flap', in the centre of which was a circular or oval aperture holding a red glass illuminated by a lamp contained with the main 'pillar' of the signal. In the 'off' position the flap dropped forward to reveal simply the white(ish) light. At some stage the signal design was modified to provide a small two-aspect (red+green) spectacle plate, fixed on the pillar in front of the light but behind the flap, which moved from 'red' to green' as the flap was lowered. (It has been suggested that this modification occurred because the red glass was susceptable to damage and a cracked glass might fall out, thereby causing the white light to give a false 'off' indication while the signal was still in the 'on' position.) After this change it would appear that the red glass in the flap was omitted, presumably because then it was considered superfluous. See here for an illustration of such a signal in both the 'on' and 'off' positions.

Although most of the Stevens 'flap' signals on the S&DJR were replaced by other types in later years, a number did survive into BR days; for example in September 1952 there was at least one still in use at Edington Junction and two at Bridgwater North. There were also at least three still in use at Highbridge as late as 1965 and it is possible that all of those survived until the line closed to passenger traffic in March 1966. The image here shows one example from Highbridge which is now at the Somerset & Dorset Railway Trust Museum at Washford; this signal is unusual in that it has two weight levers and 'slotting' gear, as it was controlled by both Highbridge East 'C' signal-box (the ex-S&DJR 'Highbridge Loco' box) and Highbridge Crossing signal-box (the ex-GWR 'Highbridge West' box). There may perhaps have been other 'flap' signals which survived beyond 1947, but were then replaced by a different pattern prior to 1966, but have escaped the photographic record. Any further information on such 'survivors' would be welcomed.

In due course the S&DJR started to use the 'miniature semaphore arm' type of ground signal for any new or replacement work, but is unclear what equipment was used initially or when it was introduced. There are references in S&DJR Signal Instructions to the use of a 'ground disc of the new pattern' at Templecombe No 3 Junction in 1907 and a 'new semaphore ground signal' at Midsomer Norton in 1910, but no photographic evidence is known for those items. [Note: the term 'disc' appears to have been used to describe ground signals regardless of their physical appearance.] There is photographic evidence from elsewhere that the L&SWR had some examples of ground signals with miniature arms fitted onto the pillar of Stevens signals instead of the flap, but it is not known if any of these were used on the S&DJR.

WBS red minature-arm ground signalIt is clear that by early SR days the S&DJR were using 'miniature semaphore' ground signals of the Westinghouse pattern. While some of these had red arms (as illustrated - click picture for larger image), there were also a few examples with yellow arms (PRSS Plate 87) installed specifically in locations where 'yellow ground signals' were required. The earliest known use of a yellow arm version on the S&DJR was at Masbury in 1928 in conjunction with a new siding. There were at least two, possibly three, with red arms at West Pennard in BR days, with circumstantial evidence that at least one of those was installed in 1929 as part of the same layout alterations which also saw the provision of two yellow arms. At least one 'miniature semaphore' with a red arm survived at Evercreech Junction until the line closed in 1966, an example that was 'elevated' a couple of feet above ground level on a short post.

Southern Railway 'disc' ground-signal  John HinsonFrom later SR days onwards many ground signals were replaced by the standard SR Westinghouse 'half-disc' pattern (PRSS Fig 20), which in effect was the same signal as the 'miniature semaphore' type but with a disc faceplate instead of a rectangular arm. By the time that the S&DJR closed to all passenger traffic in 1966, most - though by no means all - of its ground signals had been replaced by the 'half-disc' type. However in BR days two of the ground signals at Midsomer Norton were replaced (at different dates) by examples of the BR(WR) pattern 'full disc' ground signal, and a further example was fitted onto an existing bracket signal at Highbridge during layout alterations in 1965. It is possible that there may have been other BR(WR) installations which have escaped the photographic record.


Electrically-worked Signals

With four known exceptions, all the signals on the S&DJR were worked mechanically in the traditional manner, by means of wire runs from a mechanical lever-frame in the controlling signal-box or ground-frame. The first exception existed at Templecombe No 2 Junction signal-box, which gained a motor-worked Down Distant in 1933 after it took over the work of the former Templecombe No 3 Junction signal-box. Two further exceptions arrived in 1958, when alterations at the neighbouring Lamyatt and Bruton Road ground-frames (two level-crossings between Evercreech Junction and Cole) provided motor-worked Up and Down Distants that were controlled by both ground-frames. Finally in 1960 the Down Distant at Wincanton was converted to motor working when the existing signal was replaced by a new one much further away from the signal-box.

Banner repeater at Highbridge East 'A'There were also two examples of electrically-worked 'banner repeaters' on the S&DJR in later years. One example was at Evercreech Junction, just north of bridge 107, and was installed at some unknown date between 1930 and 1941 to repeat the North signal-box's Down Main Home signal. The other example was on the goods line between the Highbridge East 'B' and East 'A' signal-boxes in BR days, to repeat a pair of shunt signals at Highbridge East 'A' box, but again the exact date of installation is not known. No photograph is known of the Evercreech Junction repeater, but the one at Highbridge (click picture for larger image) was smaller than the type normally used with main running signals.

There were never any colour-light signals on the S&DJR.


Finally...

...no description of S&DJR signals would be complete without a mention of the 'Bridge Indicators' which existed at Corfe Mullen Junction in the early 1900s. Unfortunately, as described here, there are no known details of these mysterious items, which may not have been directly involved with the signalling of trains anyway.

At the extremities of the S&DJR system, where it connected with the lines of other railway companies, there were a few signals on S&DJR lines which were controlled by a signal-box of another company. Such signals may have been provided by the other companies to their own designs and have been excluded from the scope of this page.

© CJL Osment 1998-2017
Acknowledgements to Alan Price for additional information. Highbridge signals photograph © Edward Dorricott, S&DJR rail-post signal and Westinghouse 'red arm' ground signal photographs courtesy Duncan Chandler collection, signal graphics courtesy John Hinson.


References

Introduction Signal Posts Finials Signal Arms Subsidiary Signals Wrong-Road Signals Ground Signals Electric Signals