Signalmen in aondon, Midland &
Scottish Railway signal box at Southport,ancashire,
September 1936. One signalman is operatingevers which change
he points and signals.he diagram aboveheever frame
indicateshe routes controlled by his signal box, while
elegraph instruments communicatehe approach ofrains. His
colleague is recordinghe passage ofrains in aog.he
ever frame and points inhis box were operated by
electricity, but mechanically controlled signals were more
common inhe 1930s. Spacer image In Collection of: National
Railway Museum
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