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| High Speed 1 signalling question 13/04/2012 at 22:48 #31571 | |
TRC666
135 posts |
This may sound a stupid question. At cab signalling block section limit markers on this line there are also what appears to be a subsidary signal (which looks similar to shunt signal) attached to each one, even those on plain line sections with no junctions, crossovers or sidings - what are the purpose of these? This photo was taken by me at Ebbsfleet International, but these specific markers also have additional indicators as they are at platforms: 
Post has attachments. Log in to view them. Last edited: 14/04/2012 at 10:11 by TRC666 Log in to reply |
| Re: High Speed 1 signalling question 13/04/2012 at 23:32 #31572 | |
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Underwood
746 posts |
Looks like it's an Auxiliary signal: "On lines with TVM signalling, absolute stop markers (see [2.123]) and shunt markers (see [3.85]) are provided with an auxiliary signal, which is normally extinguished. When 'opened', an auxiliary signal displays two white flashing lights at 45° [9.55]. Clearance of an auxiliary signal authorises the driver to proceed on sight (e.g. during a failure or for admission into an engineering possession). Auxiliary signals can also be associated with conventional signals for use during certain failure conditions. Displaying an aspect known as a 'Proceed on Sight Authority' (PoSA)" from http://www.railsigns.co.uk/sect9page3/sect9page3.html and scroll down near the bottom, flashing position signal. Learnt something myself too! Wondered what these were actually as I noticed on Ashford IECC panel that they were on every signal, and thought they can't be just shunt signals! James. Log in to reply |
| Re: High Speed 1 signalling question 14/04/2012 at 05:34 #31577 | |
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Firefly
521 posts |
There's a rule book module giving more details at rgsonline
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