Semi Automatic Signal Photos
Fig. 1:
Semi Automatic Starting Signal at Ealing Broadway
The starting signal at platform 9, Ealing
Broadway (District) shows a simple, two-aspect semi automatic signal with its
identification plate (WP 55) indicating the area identity (WP for Ealing Broadway) and the
lever or button number 55.
Below the signal is a rail gap
indicator, which illuminates with three red lights if traction current is switched off
from the section ahead. There is also a shunt signal (WP 51) which allows moves into
the sidings. Photo by District Dave.
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Fig. 2:
Starting Signal with "Operating furniture"
The starting signal at platform 8, Ealing
Broadway (District) with rail gap indicator and a shunt signal (WP 50). The
"D" sign shows "Off", to advise drivers that de-icing equipment on
trains should be switched off.
The white box with black diagonal
stripes is a telephone with direct access to the control room at Earls Court.
Various safety messages and reminders for drivers add to the untidy clutter of furniture
around the signal. Photo by District Dave.
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Fig. 3:
Junction Starting Signal at Rayners Lane
The junction starting signal at Rayners Lane, as seen from a
Piccadilly Line train about to depart eastbound, is now showing green with three white
"harbour lights" at a 45° angle above, indicating that the route to the right
(towards South Harrow) is set and clear. For Metropolitan Line trains proceeding
towards West Harrow, only a plain green is shown. The two white discs marked
"30" and "25" indicate the speed limits for each route.
The pale blue structure in front of the signal (and almost
obscuring it) is the case containing the CCTV screens showing views of the platforms for
drivers. Tubeprune looks forward to the day when these are all replaced by in-cab
CCTV as provided on some other lines.
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Fig. 4: Shunt
Signal with Theatre Type Route Indicator
This is a shunt signal of the standard London Underground
disc type with a theatre type route indicator above. When the signal clears, the
route indicator shows the driver a number which corresponds to the route set, counting
from left to right. Thus, the indicator will show 3 if the third route from the
right is set.
The arrow under the signal identification number shows the
track which the signal applies to. This is to avoid confusion where rows of parallel
sidings each have their own shunt signal. Photo by District Dave.
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