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| East London Line 04/01/2011 at 10:26 #2193 | |
kbarber
1742 posts |
Took a trip to Dalston yesterday and noticed that none of the EL signals seem to have "auto" plates, which surprised me greatly. Is it not permitted to treat any as passable during failure of SPT? Or is there some other reason for not providing auto plates?
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| East London Line 04/01/2011 at 10:26 #13076 | |
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kbarber
1742 posts |
Took a trip to Dalston yesterday and noticed that none of the EL signals seem to have "auto" plates, which surprised me greatly. Is it not permitted to treat any as passable during failure of SPT? Or is there some other reason for not providing auto plates?
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| East London Line 04/01/2011 at 18:17 #13082 | |
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TomOF
452 posts |
I haven't looked at the workstation in a while, but many of the signals on that line are fitted with 'posa' aspects for when there is a failure preventing the signal from being cleared so they probably can't be automatic. Which bit of the line where you on at the time? Log in to reply |
| East London Line 04/01/2011 at 18:23 #13083 | |
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Firefly
521 posts |
I'm certain the scheme plan showed the signal in advance of the Plat 1 Starter as an Automatic. I only worked there for the commissioning shift so don't have access to any other documents but the plan showed it as an Auto and I don't recall seeing any notes about it being plated otherwise. FF Log in to reply |
| East London Line 05/01/2011 at 14:58 #13096 | |
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kbarber
1742 posts |
Don't have a full rundown but all the signals I noticed between Shoreditch High St and the inlet/outlet sigs at Dalston (ie all those I'd have expected to be auto, reading over plain track to the overlap beyond the next signal) had number plates but no auto plates. So given FF's comment is it possible that they're functionally auto but (for reasons unknown) not plated to be passable? (Are POSAs provided at auto signals or just controlled ones?)
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| East London Line 05/01/2011 at 20:40 #13099 | |
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clive
2789 posts |
The diagrams I have run from Dalston Junction to New Cross [Gate] and don't show *any* passable plates at all. POSAs aren't provided at all signals. They have to be at controlled signals, because the aspect must be specifically selected by the signaller. As far as I can see, every POSA reads over points and I *think* every EL signals reading over points has a POSA. Log in to reply |
| East London Line 06/01/2011 at 01:16 #13107 | |
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Firefly
521 posts |
If Clive has the plans then his information is the best to go on. I just noted the fact that the signal in advance of me was automatic and didn't note if it had a passable plate or not. I think I saw the R (replacement) symbol denoting that it was an Auto. The plans probably show lots of these:-  They must of taken a decision that none of the Auto's are passable on the ELL. FF Log in to reply |