Gantry of Signals at Ipswich, L.N.E.R.
RAILWAY signalling is a very complicated subject; and I must be content to mention just a few of its main principles. First of all, each signal-
In the picture above, therefore, only three of all the signals carried on the big “gantry” apply to trains running in the direction away from you; all the remainder concern trains coming towards you. Looking again at this photograph, you will notice that the signal-
The whole of each railway route is divided up into sections, or “blocks”, each controlled by a signal-
At junctions the array of signals becomes a good deal more complicated, as signals have to be provided to govern every line over which a train can travel. The tallest of these usually refers to the main line, and the remaining posts are “stepped” in height according to the relative importance of the line to which they refer. In the Ipswich signal-
Signals “Crossed” before being Brought into Use.
Efforts are now made to simplify these masses of signals where possible by the use of one of the “route-
Many other types of signal, which have been designed to serve special purposes, might be mentioned, and you see some of them illustrated. For example, below the signal last mentioned, there is a curious arm in the shape of a cross. This is called a “draw-
The crosses on all the signals on the large signal gantry shown above, however, are only temporary; they simply indicate that the gantry is new, and that the signals have not yet been brought into use. If you see a ring on the end of a signal-
In these days a beginning is being made m the use of what are called “three-
Another variety of the three-
The biggest signal-
In many of the largest boxes to-
Interior of Locomotive Yard Box at York, L.N.E.R.
Diagram of Points and Signals, Locomotive Yard Box, York.
Locomotive Yard Signal-
Note the ground signal in the foreground.
Another photograph shows how the taking and giving up of the token are facilitated by the erection of apparatus at the line side. As the engine passes on to the single-
Apparatus for Single-