Sprinter107
Member
- Joined
- 26 Mar 2019
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- 935
SJ89 approaching Stourbridge Junction wont show a green for trains going onto the extension line.
Never* display it or cannot display it? Important distinction.
If latter, there would usually be no green lamp fitted full stop.
*Signals will always be able to display in certain conditions, e.g. testing or when traffic levels are low.
BN133 and PN106 seem to fit those criteria and there are other interesting examples which are related. I'd say it's a pretty good investigative thread so far.
Perhaps you could post a constructive example if you are not satisfied with the quality of the material, rather than just complaining...
Signal LJ68, on the Up Main at Conwy, is a one-aspect signal: it can only show red!
The Up Main is bidirectional between Llandudno Junction and Conwy, and LJ68, just beyond Conwy station, marks the limit. Back when Conwy Valley services interworked with Holyhead stoppers, there used to be some occasional Llandudno-Conwy services too (e.g. one mid-morning shuttle in the 1994 timetable on my shelf). I've got no idea when it was last used, though.
Doesn't satisfy the OP criteria (as it doesn't actually have a green aspect), but for reference these "fixed red" signals generally are used at the end of a stretch of bi directional running where a reversal is required. They stop the driver from continuing on down stretch of track that is no longer signalled for bi-directional running.
Everything I can find about it either in my training notes and online, suggests it’s a one aspect signal only capable of showing red. It does have the two lenses but I would hazard a guess that this was installed for future preparation to extend the bi-di running (which has obviously never happened). Either that, or they had spare two aspect signal heads lying around at the time of installation and couldn’t get hold of any one aspect units.Forgive the thread resurrection, but this morning I found myself staring at LJ68 as I passed it, and noticed that it has two lamp positions on the signal head, not just the one. Whether a green or yellow bulb was ever fitted to it is another matter!
The signal that protects Shepreth Branch Jn approaching from Cambridge cannot show green for a train diverging towards Royston, even if the next signal is green. The least restrictive aspect it can show for this direction is Double Yellow.
It can’t even be that - you can’t have a main aspect reading to a shunt signal. I’d say that it’s probably one of the two things that you suggest - probably the latter!Everything I can find about it either in my training notes and online, suggests it’s a one aspect signal only capable of showing red. It does have the two lenses but I would hazard a guess that this was installed for future preparation to extend the bi-di running (which has obviously never happened). Either that, or they had spare two aspect signal heads lying around at the time of installation and couldn’t get hold of any one aspect units.
As has been mentioned, there’s nothing for it to be signalled to. You could argue it could clear to a yellow to get you to PR16 ground position signal. But that’s a stretch. And either way, it doesn’t meet the OPs parameters.
A signal cleared for a route that ends in a buffer stop will only show yellow (which is never referred to as orange or amber). This has been true since the 1974 Moorgate collision, it was never really explained why the train went at full speed through the station into a dead-end tunnel, but one result was concern about drivers being misled by green signals on the approaches to termini or bay platforms.When trains used to go into Newhaven Marine, the platform signal at the Harbour never displayed a green aspect. It was always orange with the junction feather illuminated.
Trains signalled onto the Seaford branch however, got a green aspect
It can’t even be that - you can’t have a main aspect reading to a shunt signal.
In theory, there shouldn't be any.Are there any signals on the network that for some reason cannot show green (not including signals that don't actually have a green aspect, obviously)? As in signals that technically are capable of showing a green aspect but never do in real life.
It can read *through* a running shunt, but still needs a main aspect to read *to* at the far end of the route!Unless its 'running' ....
I guess the line used to continue into some sidings and they have been removed but are still "present" in the signaling.
Thank for having a dig about for me. I don't doubt that it only shows red aspects, but the pair of lenses caught my attention yesterday. I too had been wondering if it was a case of installing whatever was to hand at the time.Everything I can find about it either in my training notes and online, suggests it’s a one aspect signal only capable of showing red. It does have the two lenses but I would hazard a guess that this was installed for future preparation to extend the bi-di running (which has obviously never happened). Either that, or they had spare two aspect signal heads lying around at the time of installation and couldn’t get hold of any one aspect units.
As has been mentioned, there’s nothing for it to be signalled to. You could argue it could clear to a yellow to get you to PR16 ground position signal. But that’s a stretch. And either way, it doesn’t meet the OPs parameters.
ARS on Edinburgh doesn't set route over Princes Street Gardens for a train stopping at Haymarket, until that train has left Haymarket station. So all stopping trains will never get better than double-yellow on those signals - unless the signaller intervenes to set route "early" over Princes Street Gardens. Non-stop (possibly ECS) trains might get a green there, but there'd have to be nothing needing to use the crossovers at Princes Street Gardens at the same time.E510 and E512 at the east end of Haymarket never seemed to get beyond a double yellow but were capable of displaying greens.
Of course this doesn't count but at Beaulieu Road, the down signal (towards Weymouth) is a signal that only shows green and yellow, but never red.
Yes, it’s a two aspect area once west of Totton, with long signal sections with distants and the ensuing long headways. Not really relevant to the topic under discussion, I’d have thought.Could that by any chance be the colour light version of a Distant signal?