Like most of the website this part is a bit of a mess, merely
a collection of useful items that I have amassed during my research
into Bristol Temple Meads East Signalling. If you're interesting
in the Great Western Railways power signalling at Bristol Temple
Meads I can do no better then to point you in the direction of
the appropriately named Power
Signalling at Bristol article!
Old Station Signal Box
Train Registers
Page 19, Page
20, Page 21, Page
22 more to come! I guess it might even help if I give you
the date of them!
Details about Bristol East
Bristol East Illuminated
A few photos
Photographers
Maurice W Earley
Collection with NRM? - APRoGWS page 72
Adrian Vaughan
APRoGWS page 41
Track Circuit Lamps
T2 - 7mm Telephone Slide Base Filament Lamps
Filament lamps will perform to specification and give optimum life
when:
a) they are powered at the rated voltage from a stabilised 50 Hz
A.C. supply
b) ambient temperature is in the range 20°C to 25°C
c) no mechanical vibration is present.
Deviations from these criteria can have a significant effect on
lamp life, particularly with low current filaments (<80 mA).
Operation from a d.c. supply at rated voltage can reduce specified
life by up to 50%.
The effect of variation from the rated operating voltage should
be noted:
5% above will reduce lamp life by up to 50%.
5% below will significantly increase lamp life.
Current consumption can vary by up to ±10% on stated values
at rated supply voltage. Care therefore should be exercised when
running a number of lamps in series. In such applications it is
recommended that the rated voltage be reduced by 10% to prevent
premature failure of individual lamps.
Technical specification
Voltage 12V
Current 100mA = 0.1A
Lumens 3
MSCP 0·24
Average life (hrs) 2,000
1 ampere = 1 000 milliamperes
123 Track Circuits = 246 Lamps
246 x 0.1A = 24.6 Amps
P=IV 24.6 x 12 = 295.2Watts
Further Reading
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Bristol East Signal Box 
