Thread: First train tested on East London Line
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Old October 9th 09, 09:33 AM posted to uk.railway,uk.transport.london
David Hansen David Hansen is offline
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Default First train tested on East London Line
On Fri, 09 Oct 2009 10:11:49 +0100 someone who may be Sam Wilson
wrote this:-

I note that railway practice includes putting a blue(ish) filter in
front of a yellow(ish) light to make a green signal

With oil lit semaphores. Electrically lit semaphores and colour
light signals are different.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000...#pt3-pb3-l1g54
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