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London North Western
Railway:
Midland
Railway:
Stratford
Midland Junction Railway
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LMS Route: Birmingham New Street to Harborne
Rotton Park Station: lnwrrp86a
Close up of image 'lnwrrp86' showing the sand drag running
the full length of the down platform and the starter signal and the catch
points. The lower quadrant signal is in the 'off' position meaning that the
train driver has authority to proceed past the signal. The signal is described
as being 'lower quadrant' because when the road is clear and the driver can
proceed, the arm points downwards some 60° below horizontal. Later
designs were designed to point upwards to some 60° above the
horizontal. The change was adopted by most railways (the GWR continued to use
lower quadrant signals) because of an accident caused by a build up of snow
preventing the signal returning to the horizontal (danger) position.
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