THE SIGNAL BOX

SIGNALS

BRITISH RAILWAY SIGNALS

Caledonian Railway Signals

Fixed Distant signal

Fixed distant signal at Coupar Angus

This lower-quadrant signal at Coupar Angus represents a typical Caledonian Railway signal, almost certainly manufactured by Stevens & Sons. The lightweight, but strong, lattice post is a typical product of theirs, but the finial from the top of the post appears to have gone missing.

Stevens & Sons had a Glasgow factory (in addition to their London one) and supplied most of the Scottish Railway companies with signalling equipment.

Coupar Angus was on the Caledonian Railway's main route to Aberdeen, but by the time of this photograph the through route had closed and the line only ran to Forfar as a single goods line. Owing to its reduced importance, the signal had become "fixed at caution". The down-rod is still connected to the balance weight, but there is no wire running down to connect the weight bar with the signal box.

More details and a view of the entire signal will be found in the Photo Gallery Page covering Coupar Angus South.


Co-acting distant signal at Alyth Junction

Co-acting Distant Signal

Where sighting was difficult a pair of arms would be provided so that one arm could be clearly seen by drivers from a distance, and the other when the train was closer.

In this instance, and overbridge across the line was the problem - and the top arm would be seen high above the parapet of the bridge. However, this could not be seen when the train was closer, and the lower arm would be seen through the bridge arch.

The signal once carried two other arms, acting as Alyth Junction Up Starter, worked by lever 56 in this once important box. Being located on the same line as Coupar Angus (above) most of the signalling was removed when singling took place, but the distant arms were retained to protect a level crossing.

The weight bars that slotted with the now removed starter arms remains. The down-rod connecting both arms with the bar is also clearly visible. The lower arm (which is shorter than the norm) is drooping with old age.

Close-up view of upper arm

Bracket signal with subsidiary arm

A divergence of route is generally made clear to drivers by the use of bracket signals. In this instance, the arm on the main post is the only main route, so the left-hand divergence (leading to a goods loop) is provided with a miniature arm. Whilst the main arm has been renewed with an LMS upper quadrant arm, the miniature arm survives in original lower quadrant condition.

The signals read from the "Platform Line" to the Up Main or Loop at Stirling Middle.

This signal was the last survivor of working lower quadrant signals in Scotland, and amazingly was still in use until 2000. The signal has now been moved to the Bo'ness & Kinneil Railway for preservation.

More details and a view of the entire signal will be found in the Photo Gallery Page covering Stirling Middle.

Stirling Middle Platform Line Up Starting Signal