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| Resignalling schemes and crossings 26/06/2011 at 18:57 #3306 | |
Lardybiker
771 posts |
It's a simple enough question though I suspect the answer is far from simple. If a line is re-signalled, what determines what sort of crossings are used? Take for example, Pasture St (In ths South Humberside sim). All the crossings had a crossing box and were converted to CCTV. However, further up the line at Habrough, we find an AHB. So if a line is converted from AB to TCB controlled from an IECC, what determines the type of crossing used? Log in to reply |
| Resignalling schemes and crossings 26/06/2011 at 18:57 #17012 | |
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Lardybiker
771 posts |
It's a simple enough question though I suspect the answer is far from simple. If a line is re-signalled, what determines what sort of crossings are used? Take for example, Pasture St (In ths South Humberside sim). All the crossings had a crossing box and were converted to CCTV. However, further up the line at Habrough, we find an AHB. So if a line is converted from AB to TCB controlled from an IECC, what determines the type of crossing used? Log in to reply |
| Resignalling schemes and crossings 26/06/2011 at 19:15 #17013 | |
headshot119
4869 posts |
It's mainly down to how busy the road is, how many people use it, and at what times of day etc
"Passengers for New Lane, should be seated in the rear coach of the train " - Opinions are my own and not those of my employer Log in to reply |
| Resignalling schemes and crossings 26/06/2011 at 19:49 #17014 | |
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UKTrainMan
1803 posts |
One wonders if it may depend on what sort of re-signalling is done? If they were perhaps only upgrading 'old filament(?) signals' to the lovely new LED signals then surely no changes would occur to level crossings if not needed/required?
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 |
| Resignalling schemes and crossings 26/06/2011 at 20:11 #17015 | |
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Noisynoel
989 posts |
UKTrainMan said:One wonders if it may depend on what sort of re-signalling is done? If they were perhaps only upgrading 'old filament(?) signals' to the lovely new LED signals then surely no changes would occur to level crossings if not needed/required?That isn't a resignalling scheme as LED's are being introuced on a signal head by sgnal head basis, withthose prone t sunlight or life expired being done before others. Noisynoel Log in to reply |
| Resignalling schemes and crossings 26/06/2011 at 20:37 #17016 | |
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Lardybiker
771 posts |
I am refering to replacing AB with MAS....rather than replacing MAS with more MAS
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| Resignalling schemes and crossings 26/06/2011 at 20:48 #17017 | |
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Zoe
252 posts |
Lardybiker said:I am refering to replacing AB with MAS....rather than replacing MAS with more MAS AB is the method of working and not the type of signals. It's quite possible to have multi-aspect colour light signals in Absolute Block areas or semaphore signals in TCB areas. Log in to reply |
| Resignalling schemes and crossings 28/06/2011 at 07:45 #17029 | |
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ralphjwchadkirk
275 posts |
I assume he means replacing AB with TCB...
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| Resignalling schemes and crossings 30/06/2011 at 22:41 #17100 | |
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Firefly
521 posts |
I think we all know what he's asking. AHB's are cheaper and do not take up any signaller capacity (unless they fail), therefore AHB's would be preferred to CCTV. Of course doing away with the crossing all together is the HMRI and NR's preferred option. Things that would prevent an AHB being installed include road too busy, school nearby, road approach characteristics (on a sharp bend), risk of traffic backing up onto crossing, Speed of approaching trains very different (95% of trains must arrive at an AHB within75 seconds of the sequence starting). These are just a few reasons that would prevent the use of an AHB and force the designer down the controlled crossing route. Hope that helps. FF EDIT: correcting the slow train figures Log in to reply |
| Resignalling schemes and crossings 01/07/2011 at 05:44 #17106 | |
Peter Bennet
5402 posts 
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Way back when Dundee was resignalled in the mid '80s from several AB boxes to the current signalling centre the gated level crossing at Broughty Ferry (where I used to live) was retained for many years because of local opposition to barriers. The main issue was that you had 90mph trains running through the town centre and across one of the busiest roads therein. The box was retained to operate them and it was only after a HST smashed into them at speed (conspiracy theorists claim it was deliberate!) in 1990(?) that the council relented and granted planning permission to install the CCTV crossing . From memory the road (Grey Street) was blocked for years while they argued over the matter. Peter I identify as half man half biscuit - crumbs! Log in to reply |