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| Nx Panel Block Joints 27/04/2012 at 06:34 #31873 | |
ozrail
197 posts |
I've noticed on the Nx Panel were I work there are small white boxes inside some of the black boxes representing the block joints. I have no idea why they are there or what they represent. Today I asked the local Signal Engineer, but him so far have received no reply or explanation. Can anyone help?
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| Re: Nx Panel Block Joints 27/04/2012 at 07:09 #31874 | |
AndyG
1842 posts |
They are to indicate the ends of the overlaps from signals.
I can only help one person a day. Today's not your day. Tomorrow doesn't look too good either. Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 07:59 #31877 | |
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ozrail
197 posts |
That may be right, but on the panel it even has the white boxes on block joints in automatic signalling sections. Could they be for overlaps on signals within a uncontrolled section?
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| Re: Nx Panel Block Joints 27/04/2012 at 08:04 #31878 | |
onlydjw
456 posts |
Yes.
God bless, Daniel Wilson Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 08:38 #31879 | |
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Stephen Fulcher
2078 posts |
Automatic signals have the same requirement for an overlap as any controlled signal. They may not have different track circuits for the overlap like a controlled signal, but the overlap is still there. Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 10:16 #31882 | |
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ozrail
197 posts |
I have been looking at the panel for a week now trying see a pattern to the locations of the white squares, but I can now see what you’re all talking about. Should have mentioned it’s the Strathfield Signal Box in Australia, and it’s a Westinghouse built Nx panel commissioned in 1982. Which in the end follows UK signalling convention.
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| Re: Nx Panel Block Joints 27/04/2012 at 12:53 #31885 | |
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Firefly
521 posts |
Perhaps a photo would help
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| Re: Nx Panel Block Joints 27/04/2012 at 13:36 #31886 | |
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ozrail
197 posts |
 Here is a photo taken from my phone. Notice some block joints have the white boxes and some do not. Post has attachments. Log in to view them. Last edited: 27/04/2012 at 13:38 by ozrail Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 14:28 #31887 | |
GeoffM
6376 posts |
Are the top two lines freight-only?
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| Re: Nx Panel Block Joints 27/04/2012 at 16:06 #31889 | |
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Signalhunter
177 posts |
" said:Are the top two lines freight-only?If they are now, surely, they weren't originally. Otherwise, P1 is not needed. Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 19:42 #31895 | |
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Firefly
521 posts |
Are the blue and brown lines electrified? Could it be sub station boundaries? (isolation sections)
Last edited: 27/04/2012 at 19:43 by Firefly Log in to reply |
| Re: Nx Panel Block Joints 27/04/2012 at 22:36 #31901 | |
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ozrail
197 posts |
The photo is of the six lines between Strathfield and Sydney Central. The top green line are called the Main Lines and are mainly used by long distance or fast trains, the Brown Lines are called the Suburban lines and are used by semi-fast trains and the Blue lines are the Local lines are used by all stations trains. But any train can use any line. They all have 1500 volt dc overhead and at this location at Croydon it is around 10 kilometres from Sydney. The little white block also appear on block joints after points and on recently commissioned signalling as well. I will take another photo today and post it to shown the other locations.
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| Re: Nx Panel Block Joints 28/04/2012 at 01:26 #31903 | |
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GeoffM
6376 posts |
" said:" said:Not necessarily. Different country, different rules. In any case I'm sure there are, or at least were, numbered platforms for freight only use in the UK.Are the top two lines freight-only?If they are now, surely, they weren't originally. Otherwise, P1 is not needed. Moot point now anyway! SimSig Boss Log in to reply |
| Re: Nx Panel Block Joints 28/04/2012 at 13:09 #31911 | |
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ozrail
197 posts |
After testing the panel signals at work today I can confirm that the white blocks mark the point at which the second signal to the rear will show a clear indication. In other words the clearing point for the signal and its overlap. Thanks again for everyones help.
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| Re: Nx Panel Block Joints 28/04/2012 at 15:17 #31912 | |
postal
5264 posts 
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" said:In any case I'm sure there are, or at least were, numbered platforms for freight only use in the UK.Not so sure about freight, but certainly for mails. Royal Mail used platforms which were closed to the public but which were numbered in the station sequence. From personal experience I know of such platforms Plymouth, Stafford and Preston. Those at Preston and Stafford were separated from the rest of the station and only reached by subway or footbridge. In 1996, Royal Mail moved from handling of loose mail bags to roll-cages and the platforms at Plymouth and Stafford were raised above normal height to allow for the easy transfer of the cages. Use of Preston ceased at that point with the work going into the terminal at Dallam, Warrington. “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 |
| Re: Nx Panel Block Joints 29/04/2012 at 15:35 #31957 | |
jc92
3685 posts |
does nottingham parcels platform also count?
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| Re: Nx Panel Block Joints 29/04/2012 at 23:04 #31987 | |
BarryM
2158 posts |
" said:After testing the panel signals at work today I can confirm that the white blocks mark the point at which the second signal to the rear will show a clear indication. In other words the clearing point for the signal and its overlap. Thanks again for everyones help.Ozrail, Railcorp's Chief Engineer Signals and Control Systems confirms your observations. Barry Sydney NSW Barry, Sydney, New South Wales, Australia Log in to reply |
| Re: Nx Panel Block Joints 30/04/2012 at 04:36 #31991 | |
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ozrail
197 posts |
Thanks, Barry, that's good to know. Can't beat your source.
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