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| Green Banner signal 30/12/2014 at 13:16 #67191 | |
Peter Bennet
5402 posts |
Noticed this morning as we zipped through Ally Pally that there was a banner signal off on the Up Slow and it displayed green with the diagonal black bar: not noticed one of them before. Wonder what colour it dispays when on; or indeed if the colour is dependant on the aspect of the signal it is reporting on. Peter I identify as half man half biscuit - crumbs! Log in to reply |
| Green Banner signal 30/12/2014 at 13:24 #67192 | |
Splodge
717 posts |
According to the Railsigns website - http://www.railsigns.uk/sect7page3/sect7page3.html - green is only colour displayed; other more restrictive aspects retain the previous white off and on indications. I read elsewhere that these repeaters have been well used around Stafford, and because of this (the green telling the driver he has a clear run and not simply an off aspect) have allowed the speed limit on the slow lines to be increased between Stafford and Crewe. There's the right way, the wrong way and the railway. Log in to reply The following user said thank you: Peter Bennet |
| Green Banner signal 30/12/2014 at 14:18 #67194 | |
GW43125
495 posts |
The green banner repeaters are normal banner repeaters, but with an extra clear indication. The aspects displayed are as follows: For red signal............White 'on' indication For Yellow/YY signal......White 'off' indication For green signal..........Green 'off' indication Hope this helps, Jamie. Log in to reply |
| Green Banner signal 30/12/2014 at 14:43 #67196 | |
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JamesN
1607 posts |
There's one in the Watford Jn Sim, on the Up Fast approaching Watford North Tunnel
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| Green Banner signal 30/12/2014 at 17:04 #67198 | |
lazzer
634 posts |
We have many three-state banner repeaters (to give them their correct name) on the Western region now, mostly around Reading and as part of the CrossRail improvements between Airport Junction and Paddington.
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| Green Banner signal 30/12/2014 at 17:42 #67203 | |
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Danny252
1461 posts |
" said:We have many three-state banner repeaters (to give them their correct name) on the Western region now, mostly around Reading and as part of the CrossRail improvements between Airport Junction and Paddington.Sounds like they're standard for new installations, then? Log in to reply |
| Green Banner signal 30/12/2014 at 18:22 #67204 | |
GeoffM
6376 posts |
" said:" said:I wouldn't say they're standard in the context of always using them, but yes standard as in a normal option if desired.We have many three-state banner repeaters (to give them their correct name) on the Western region now, mostly around Reading and as part of the CrossRail improvements between Airport Junction and Paddington.Sounds like they're standard for new installations, then? SimSig Boss Log in to reply |
| Green Banner signal 31/12/2014 at 16:43 #67248 | |
ajax103
1120 posts |
Peterborough also has it for Platform 3, was a new installation as before the driver could see the next signal, with a platform now being there it has reduced the visability hence the banner repeater just north of the platform.
Last edited: 31/12/2014 at 16:44 by ajax103 Log in to reply |
| Green Banner signal 31/12/2014 at 17:56 #67249 | |
belly buster
368 posts |
I'm pretty sure I have seen these at Rugby as well.
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| Green Banner signal 31/12/2014 at 17:58 #67250 | |
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Stephen Fulcher
2078 posts |
I would have thought they would be fairly common on high speed lines.
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| Green Banner signal 01/01/2015 at 10:22 #67265 | |
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kbarber
1742 posts |
A number of green banners have been introduced on the Midland Main Line fast lines over the last couple of years to facilitate line speed improvements. There is one on the down fast at St Albans, right outside the (rather more interesting IMO) St Albans South signalbox. I believe there's also one on the up somewhere around the exit to Elstree Tunnel. They may be distinguished from a standard banner repeater by the 'screw head' device on their number plate.
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| Green Banner signal 01/01/2015 at 22:06 #67287 | |
Jamesh1492
23 posts |
It's to keep the high speed trains running at top speed so I been told.
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| Green Banner signal 02/01/2015 at 21:21 #67306 | |
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Ianno
28 posts |
I believe that Green Banner Repeaters are usually located where the additional information provided will be advantageous to the driver, with a green indication having the implication that a driver can expect proceed aspects all of the way through a station or junction area where there would otherwise be a reasonable likelihood of a red signal being observed due to conflicting movements. Examples I can think of are: -Up Fast north of Norton Bridge, with green implying wroute clear all the way through Norton Bridge itself -Up Fast at Wolverton, with green implying clear all way through Milton Keynes Central -Up Fast at Watford Tunnel, with green implying clear all way through Watford Junction Log in to reply |
| Green Banner signal 03/01/2015 at 00:05 #67310 | |
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Wells
82 posts |
there are a few repeater signalls at rugby to if I'm not mistaken I'm sure the main line going North there is a repeater signal the goes green Paul Log in to reply |
| Green Banner signal 03/01/2015 at 09:03 #67313 | |
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Forest Pines
525 posts |
" said:I believe that Green Banner Repeaters are usually located where the additional information provided will be advantageous to the driver, with a green indication having the implication that a driver can expect proceed aspects all of the way through a station or junction area where there would otherwise be a reasonable likelihood of a red signal being observed due to conflicting movements.Presumably they can sometimes also allow line speeds to be raised slightly because they effectively extend the sighting time and allow the driver's braking point to be further in rearof the signal. (hopefully if I'm wrong there will be an expert to say "no, you can't use a banner's sighting time to determine line speeds) One example I'm aware of seems to be for this purpose: it's on the down GWML repeating the signal that protects Keynsham station. The distance from it to the signal in advance seems shorter than other signal sections in the area, and as it's a 3-aspect signal there would seem to be little leeway available: drivers have to brake as soon as they see a yellow. It's also common, if you're following a stopping train, to get either a red or a yellow at that signal. Log in to reply |
| Green Banner signal 03/01/2015 at 15:05 #67323 | |
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Danny252
1461 posts |
" said:" said:That seems to be the idea, but I can't fathom the logic behind why a Green BR does this better than a standard BR - the only time there's a difference is if there's no reason for the driver to be braking! It may well raise the average speed at which trains run (without a speed limit change) because they can accelerate earlier, but surely the braking distances are identical to how they would be with a normal BR?I believe that Green Banner Repeaters are usually located where the additional information provided will be advantageous to the driver, with a green indication having the implication that a driver can expect proceed aspects all of the way through a station or junction area where there would otherwise be a reasonable likelihood of a red signal being observed due to conflicting movements.Presumably they can sometimes also allow line speeds to be raised slightly because they effectively extend the sighting time and allow the driver's braking point to be further in rearof the signal. (hopefully if I'm wrong there will be an expert to say "no, you can't use a banner's sighting time to determine line speeds) Log in to reply |
| Green Banner signal 03/01/2015 at 16:05 #67325 | |
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37087
43 posts |
A very positive addition to the network. In short, they give added sighting distance. If I am passing Rugby platform at 125mph and sight the Green Repeater, I am feeling more confident about haring round the corner and seeing a Double Yellow. Similarly, if there is a Double Yellow, seeing the Banner Repeater at the Off Position but white means I can brake a bit earlier. Especially important during poor weather conditions.
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| Green Banner signal 03/01/2015 at 16:06 #67326 | |
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37087
43 posts |
And yes, where signals are slightly closer together even in four-aspect territory the line speed could come have to come down to 110mph. No thanks!
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| Green Banner signal 03/01/2015 at 20:05 #67338 | |
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Late Turn
699 posts |
My understanding - not as a signalling design expert! - is that a green banner alone won't allow the linespeed to be increased, as the braking distance is still taken to commence at the signal itself. As 37087 says, banner repeaters in general merely increase the effective sighting distance of the signal where it'd otherwise be substandard, and a green banner just conveys more information. That makes sense - a driver who's overlooked the fact that a green banner has been installed at a given location wouldn't make the connection between a white 'off' indication and a non-green aspect, potentially only braking when the signal itself is sighted. The main purpose, again as I understand it, is to give drivers the confidence to maintain linespeed where they were previously easing off slightly just in case the signal was double yellow, where it was a bit tight (but compliant) to the red. Log in to reply |
| Green Banner signal 03/01/2015 at 23:42 #67353 | |
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Finger
220 posts |
" said:A very positive addition to the network. In short, they give added sighting distance. If I am passing Rugby platform at 125mph and sight the Green Repeater, I am feeling more confident about haring round the corner and seeing a Double Yellow. Similarly, if there is a Double Yellow, seeing the Banner Repeater at the Off Position but white Aren't you just as confident when hearing a ding from AWS? Log in to reply |
| Green Banner signal 03/01/2015 at 23:54 #67356 | |
KymriskaDraken
963 posts |
Should you really be doing 125mph in a Class 37?
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| Green Banner signal 03/01/2015 at 23:54 #67357 | |
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KymriskaDraken
963 posts |
" said:A very positive addition to the network. In short, they give added sighting distance. If I am passing Rugby platform at 125mph and sight the Green Repeater, I am feeling more confident about haring round the corner and seeing a Double Yellow. Similarly, if there is a Double Yellow, seeing the Banner Repeater at the Off Position but white means I can brake a bit earlier. Especially important during poor weather conditions.Should you be doing 125 in a Class 37? Log in to reply |