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| Flashing Yellows 30/11/2009 at 10:52 #326 | |
Paul Anderson
4 posts |
I am Just wondering do the flashing yellows for the high speed junction at Woolmer Green From Down main to Down slow show up on the sim. I only ask because I have just revisted the Kings Cross sim, and they are not being displayed. for when I set the pegs for the down main to down slow.
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| Flashing Yellows 30/11/2009 at 10:52 #4692 | |
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Paul Anderson
4 posts |
I am Just wondering do the flashing yellows for the high speed junction at Woolmer Green From Down main to Down slow show up on the sim. I only ask because I have just revisted the Kings Cross sim, and they are not being displayed. for when I set the pegs for the down main to down slow.
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| Flashing Yellows 30/11/2009 at 10:55 #4693 | |
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Noisynoel
989 posts |
Do you have the panel signals tab clicked (Press F3, then click the display tab). If they are selected then you will only ever see red & green aspects indicating whether the signal is on or off, you won't actually see what aspect is being displayed outon the ground
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| Flashing Yellows 30/11/2009 at 19:22 #4705 | |
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Paul Anderson
4 posts |
Thank you they are now flashing away
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| Flashing Yellows 01/12/2009 at 10:06 #4722 | |
ajax103
1104 posts |
Flashing yellow aspects A flashing single or double yellow aspect indicates that a train is to take a diverging route ahead with a lower line speed than the main route, indicating to the driver to slow the train down in time for the speed limit of the diverging route. A flashing double yellow (only used in 4-aspect territory) means that the next signal is showing flashing single yellow. A flashing single yellow means that the next signal at the junction is showing (steady) single yellow with an indication for a diverging route, and the signal after (in advance of) the junction may be red. When the train has neared the junction and slowed down, the junction signal may 'step up' to the correct aspect depending on the state of the line ahead. [img width=100px height=100px]http://upload.wikimedia.org/wikipedia/commons/b/b6/Flashing_yellow_signal_aspects.gif[/img] Thanks to Wikipedia for the article but this should explain better why and how the "flashing" aspect signalling works at Woolmer Green. Log in to reply |
| Flashing Yellows 01/12/2009 at 12:00 #4725 | |
postal
5190 posts 
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If you want to read the rules governing operations on the UK rail system, the actual RSSB Rule Book is available on-line in 48 modules. The signalling module contains 2 sections about flashing 4-aspect and 3-aspect signals (Sections 2.5 and 2.6) and can be read at http://www.rgsonline.co.uk/Rule_Book/Rule%20Book%20Modules/S%20-%20Signals/GERT8000-S1%20Iss%201.pdf
“In life, there is always someone out there, who won’t like you, for whatever reason, don’t let the insecurities in their lives affect yours.” – Rashida Rowe Log in to reply |
| Flashing Yellows 04/12/2009 at 21:03 #4829 | |
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Domino70
6 posts |
This is the normal way of working... But on Digswell Jn. up line there seems to be an exception. If I set a diverging route from signal 624 too late and the train has already passed the double yellow (signal 628), the signals 626/624 will remain Y/R, they will not "step up" to Yf/Y. This applies only to the up line. Is this normal? If yes, what is the rationale behind?
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| Flashing Yellows 05/12/2009 at 04:08 #4839 | |
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UKTrainMan
1803 posts |
Not quite sure what you mean there Domino70. I just had a quick go at KingsX and had a train on the up fast from somewhere north of Woolmer Green Junction approach Signal 628 then waited until the signal had turned red before setting the diverging route from Signal 624 to Signal 622 and Signal 626 still flashed single yellow. Are you sure you correctly set the route from Signal 624 to Signal 622 and didn't set the route from Signal 624 to Signal 620? Signal 624 to Signal 622 is the diverging route to use the Up platforms at Welwyn Garden City station, but Signal 624 to Signal 620 isn't the diverging route. Hope this helps (a bit). Any views and / or opinions expressed by myself are from me personally and do not represent those of any company I either work for or am a consultant for. Log in to reply |
| Flashing Yellows 05/12/2009 at 11:43 #4847 | |
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pilotman
189 posts |
Is it possible that leaving the route setting late means you are trying to swing the overlap with the train too close. If it's set for the through route it will stay that way with the signal at red until the approach locking reckons the train has slowed sufficiently to stop at the signal if the points fail to swing.
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| Flashing Yellows 05/12/2009 at 20:20 #4850 | |
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Domino70
6 posts |
pilotman: no, it is not the overlap :) UKTrainMan: yes, it is the diverging route. I performed a couple of tests today. After setting the route from 624 to 622 signals 626/624 will step from Y/R to Yb/Y if - there is a route set from 622 (even if 622 is approach-locked), OR - the route was set early enough (the train just passed 628 – there seems to be a timer for this) If the train is close enough to the signal 626, when I set a diverging route from 624, the driver will not be notified and will prepare to stop in front of 624... I discovered the logic, but still don't know the rationale :) (By the way, sorry for my English, I am a Hungarian.) Log in to reply |
| Flashing Yellows 05/12/2009 at 22:41 #4856 | |
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clive
2737 posts |
From memory, trains have to be at least 360m from a flashing signal before it starts flashing, so that the driver will have a reasonable chance to see it flashing.
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| Flashing Yellows 06/12/2009 at 13:40 #4861 | |
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Domino70
6 posts |
Thanks. Well, this gives answer to the second condition (route must be set in time). But if I set a route from 622, 626 will start flashing anyway... 
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