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| Shunting signal 751 20/06/2013 at 18:00 #45852 | |
block_operator
17 posts |
At the CE Works siding at Exeter Jn, there is a shunting signal 751 that displays a yellow position light stop aspect. From the position of the following crossover, there is no way to take a movement onto a running line from that signal. So, why is the yellow aspect used here? Joern Last edited: 20/06/2013 at 18:00 by block_operator Log in to reply |
| Shunting signal 751 20/06/2013 at 18:33 #45853 | |
John
884 posts |
They are generally associated with shunt moves towards a headshunt. A ground position light signal displaying a yellow aspect may be passed when "on" for shunt movements into the headshunt. This saves frequent operation of the signal when shunting is taking place. Log in to reply |
| Shunting signal 751 20/06/2013 at 22:42 #45855 | |
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UKTrainMan
1803 posts |
And here are two associated external links covering this subject - something I trust people will find interesting. Section on a Wikipedia article A specific page (see "[3.84]" at the end/bottom) on the excellent RailSigns.co.uk website. 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. Last edited: 21/06/2013 at 12:59 by UKTrainMan Reason: minor clarification for the second link Log in to reply The following users said thank you: BarryM, maxand |
| Shunting signal 751 21/06/2013 at 08:30 #45858 | |
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block_operator
17 posts |
I know the rules. That's why I was asking. From that signal, there is just one route. All movements passing that signal would go into a siding. There is no way to enter a running line. That means, all movements may pass that signal while displaying a stop aspect. If there is no movement that has ever to stop at that signal, what is the purpose of the signal? The signal may be cleared for a shunt route leading into the right siding. Since all movements into that siding may pass the yellow stop aspect, why can this signal be cleared for that route? From my understanding, the signal would make sense to provide flank protection to diverging moves through the crossover. However, for that purpose, a red aspect should be used. Joern Log in to reply |
| Shunting signal 751 21/06/2013 at 10:24 #45859 | |
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mfcooper
707 posts |
NB: Terminology. The West Sidings are behind 751 signal. The East Sidings are behind 408 signal. From 751, there are actually 2 possible routes out on the ground. The first is as shown in the sim, and Quail/TRACKmaps tells me this is known as the East Sidings. These only give access to/from the West sidings & the main line. The East Sidings seems to have been designed to be reversing sidings and not storage sidings. The second route from 751 is not shown on the sim, and I must assume it is not shown on the real Exeter panel. There is a shunt neck that, if drawn on the sim, would be to the top-right from 751 signal. This shunt neck would explain why 751 is a yellow shunt. To get from the East to the West sidings, or West to the East, trains need a route set from the signal box. For trains in the West sidings that wish to use the shunting neck, they can pass the yellow shunt signal to this neck. Last edited: 21/06/2013 at 10:36 by mfcooper Log in to reply The following users said thank you: John, block_operator |
| Shunting signal 751 21/06/2013 at 12:49 #45861 | |
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Stephen Fulcher
2078 posts 
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Sometimes it also happens that a headshunt might be removed on the ground, but the signal not replaced for a red one.
Log in to reply The following user said thank you: block_operator |
| Shunting signal 751 21/06/2013 at 19:46 #45876 | |
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block_operator
17 posts |
" said:
Thank you, that makes sense! Joern Log in to reply |