TonyK
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Posts: 6435
The artist formerly known as Four Track, Now!
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« Reply #3495 on: January 09, 2020, 10:56:05 » |
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Damaged dropper, which that train's pantograph hit causing pan to drop and section to trip. All fine with minimal damage after that dropper was removed with normal working resumed at 17:42, but heavy traffic delayed repair staff so trains routed through the up relief platform whilst waiting for them. I would imagine proper repairs will take place overnight? https://66.media.tumblr.com/ee8ba40fda563d662d31c48e65d4e288/tumblr_inline_pfvxb1EaGt1srob4n_1280.png I imagine that sort of thing have required a full isolation on the older style 'headspan' OHLE and trains would have been stopped for ages, instead of regaining 75% of capacity within a few minutes? It is good that the effect on rail services wasn't the degree of total and catastrophic that we have become used to, but is it worrying that the failure of such a small part caused such disruption?
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Now, please!
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stuving
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« Reply #3496 on: January 09, 2020, 11:52:08 » |
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Damaged dropper, which that train's pantograph hit causing pan to drop and section to trip. All fine with minimal damage after that dropper was removed with normal working resumed at 17:42, but heavy traffic delayed repair staff so trains routed through the up relief platform whilst waiting for them. I would imagine proper repairs will take place overnight? https://66.media.tumblr.com/ee8ba40fda563d662d31c48e65d4e288/tumblr_inline_pfvxb1EaGt1srob4n_1280.png I imagine that sort of thing have required a full isolation on the older style 'headspan' OHLE and trains would have been stopped for ages, instead of regaining 75% of capacity within a few minutes? It is good that the effect on rail services wasn't the degree of total and catastrophic that we have become used to, but is it worrying that the failure of such a small part caused such disruption? That's really just the nature of the system, being a network. Big interconnected systems tend to have this "every little bit's gotta work" principle, though railways do have it more than some others. It does make it harder work getting resilience up to a worthwhile level - this was one of the main reasons why buses took over from trams and trolleybuses, after all. Maybe we need one of those Cummings-approved oddballs to bring the ideas behind IP routeing into railways? Obviously it would be possible if you rebuilt all those parallel lines Beeching closed, and then built a load more ... just as long as you don't mind having no idea which route you'll be travelling on, or how long it will take.
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Electric train
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« Reply #3497 on: January 09, 2020, 22:31:08 » |
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Damaged dropper, which that train's pantograph hit causing pan to drop and section to trip. All fine with minimal damage after that dropper was removed with normal working resumed at 17:42, but heavy traffic delayed repair staff so trains routed through the up relief platform whilst waiting for them. I would imagine proper repairs will take place overnight? https://66.media.tumblr.com/ee8ba40fda563d662d31c48e65d4e288/tumblr_inline_pfvxb1EaGt1srob4n_1280.png I imagine that sort of thing have required a full isolation on the older style 'headspan' OHLE and trains would have been stopped for ages, instead of regaining 75% of capacity within a few minutes? Not necessarily, displaced droppers happen quite often, they are designed to give way if hit by a pan and the pan is designed to drop. Risk on units with a single pan is it may need another unit to rescue it. NR» 's MOMs▸ (Mobile Operations Managers) are trained to use live line poles with a range of attachments to remove objects from the OLE▸ including damaged droppers. This allows the resumption of traffic usually at a reduced speed until the OLE maintenance team arrive to assess if normal running can resume
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Starship just experienced what we call a rapid unscheduled disassembly, or a RUD, during ascent,”
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IndustryInsider
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« Reply #3498 on: January 10, 2020, 07:34:02 » |
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Thanks for that, ET. I believe that different rules apply if there has been a ADD▸ in an area of headspan Over-Head Line Equipment (OHLE) as opposed to cantilever or portal, which will likely delay resumption of normal working?
Edit: VickiS - Clarifying Acronym
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« Last Edit: April 14, 2021, 15:59:25 by VickiS »
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To view my GWML▸ Electrification cab video 'before and after' video comparison, as well as other videos of the new layout at Reading and 'before and after' comparisons of the Cotswold Line Redoubling scheme, see: http://www.dailymotion.com/user/IndustryInsider/
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Gordon the Blue Engine
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« Reply #3499 on: January 10, 2020, 09:23:23 » |
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I noticed in Lisbon (the Portugal one) that the tram operator has a scissors jack vehicle with the platform mounted on 4 insulators, so they could maintain/repair the overhead wires while still live. Sometimes they would just move the vehicle out of the way when a tram came along.
Of course they had to remember not to touch anything on the wrong side of the insulators while they were up there. And I accept that a Risk Assessment may rule out that method of working for 25kV!
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Oxonhutch
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« Reply #3500 on: January 10, 2020, 11:41:43 » |
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And I accept that a Risk Assessment may rule out that method of working for 25kV!
The laws of physics still apply - just use bigger insulators !
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stuving
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« Reply #3501 on: January 10, 2020, 12:25:38 » |
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I noticed in Lisbon (the Portugal one) that the tram operator has a scissors jack vehicle with the platform mounted on 4 insulators, so they could maintain/repair the overhead wires while still live. Sometimes they would just move the vehicle out of the way when a tram came along.
Of course they had to remember not to touch anything on the wrong side of the insulators while they were up there. And I accept that a Risk Assessment may rule out that method of working for 25kV!
Oddly enough, when I was in Lisbon I saw a couple of blokes dragging a steel tower on wheels around in the street - but no insulators. They were checking the (mains) bulbs in strings of decorative lights, which in the dark and drizzle seemed dodgy enough. But there were tram OLE▸ wires too, and the tower only just passed under them. Now that was 25 years ago, and I'm sure practices and attitudes to safety have moved on a lot since then. Likewise on the local trains, where you'd see people standing next to the open doors - and it wasn't even that hot (it was November).
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SandTEngineer
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« Reply #3502 on: January 10, 2020, 18:11:02 » |
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Red Squirrel
Administrator
Hero Member
Posts: 5190
There are some who call me... Tim
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« Reply #3503 on: January 11, 2020, 16:15:36 » |
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Damaged dropper, which that train's pantograph hit causing pan to drop and section to trip. All fine with minimal damage after that dropper was removed with normal working resumed at 17:42, but heavy traffic delayed repair staff so trains routed through the up relief platform whilst waiting for them. I would imagine proper repairs will take place overnight? https://66.media.tumblr.com/ee8ba40fda563d662d31c48e65d4e288/tumblr_inline_pfvxb1EaGt1srob4n_1280.png I imagine that sort of thing have required a full isolation on the older style 'headspan' OHLE and trains would have been stopped for ages, instead of regaining 75% of capacity within a few minutes? It is good that the effect on rail services wasn't the degree of total and catastrophic that we have become used to, but is it worrying that the failure of such a small part caused such disruption? That's really just the nature of the system, being a network. Big interconnected systems tend to have this "every little bit's gotta work" principle, though railways do have it more than some others. It does make it harder work getting resilience up to a worthwhile level - this was one of the main reasons why buses took over from trams and trolleybuses, after all. Maybe we need one of those Cummings-approved oddballs to bring the ideas behind IP routeing into railways? Obviously it would be possible if you rebuilt all those parallel lines Beeching closed, and then built a load more ... just as long as you don't mind having no idea which route you'll be travelling on, or how long it will take. I remember learning about how Arpanet, later known as the Internet, works. I had not long read the Beeching report, which was all about identifying and removing any redundancy from the rail network. Imagine my surprise to learn that, given the brief of designing a resilient network, one of the fundamental precepts ARPA applied was seamless invisible multiple redundancy. I think it is fair to assume that resilience was not part of Beeching's brief.
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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broadgage
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« Reply #3504 on: January 11, 2020, 17:10:12 » |
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DO NOT TRY THIS. VERY DANGEROUS - extra warning added by Grahame as members have expressed concern. Better say "Don't do this" even three times than risk anyone missing the message
Live conductors may be touched with impunity provided that the person doing the touching is sufficiently insulated from earth, such that no current can pass through the person.
Observe for example that birds perch on high voltage wires without harm, there is no path via the bird to earth. If however the bird comes too close to anything earthed then it will be killed.
It is in theory perfectly safe to stand upon an energised conductor rail, provided that no part of you is in contact with earth.DO NOT EVEN THINK ABOUT ACTUALLY TRYING THIS. THE SLIGHTEST TRIP OR STUMBLE COULD KILL YOU
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« Last Edit: January 11, 2020, 19:41:01 by grahame »
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A proper intercity train has a minimum of 8 coaches, gangwayed throughout, with first at one end, and a full sized buffet car between first and standard. It has space for cycles, surfboards,luggage etc. A 5 car DMU▸ is not a proper inter-city train. The 5+5 and 9 car DMUs are almost as bad.
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Red Squirrel
Administrator
Hero Member
Posts: 5190
There are some who call me... Tim
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« Reply #3505 on: January 11, 2020, 17:15:55 » |
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Live conductors may be touched with impunity provided that the person doing the touching is sufficiently insulated from earth, such that no current can pass through the person.
Observe for example that birds perch on high voltage wires without harm, there is no path via the bird to earth. If however the bird comes too close to anything earthed then it will be killed.
It is in theory perfectly safe to stand upon an energised conductor rail, provided that no part of you is in contact with earth.DO NOT EVEN THINK ABOUT ACTUALLY TRYING THIS. THE SLIGHTEST TRIP OR STUMBLE COULD KILL YOU
Quite so: https://www.youtube.com/watch?v=6_NEAEGeFIw
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Things take longer to happen than you think they will, and then they happen faster than you thought they could.
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TaplowGreen
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« Reply #3506 on: January 24, 2020, 06:15:43 » |
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Delays to services between London Paddington and Slough Due to a fault with the signalling system between London Paddington and Slough the London Paddington bound high speed line is blocked. Train services running to and from these stations may be delayed by up to 15 minutes. Disruption is expected until 07:00 24/01.
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TaplowGreen
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« Reply #3507 on: February 05, 2020, 20:37:58 » |
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Alterations to services between London Paddington and Ealing Broadway Due to a fault with the signalling system between London Paddington and Ealing Broadway trains have to run at reduced speed on some lines. Train services running to and from these stations may be delayed or revised. Disruption is expected until 22:00 05/02.
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TaplowGreen
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« Reply #3508 on: February 09, 2020, 12:25:31 » |
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Cancellations to services between Maidenhead and London Paddington
Due to damage to the overhead electric wires between Maidenhead and London Paddington fewer trains are able to run on all lines. Train services running to and from these stations may be cancelled or delayed.
Disruption is expected until 16:00 09/02.
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charles_uk
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« Reply #3509 on: February 17, 2020, 14:54:18 » |
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Not sure if this has been caused by Storm Dennis or not - for the record: Cancellations to services between Didcot Parkway and Reading
Due to damage to the overhead electric wires between Didcot Parkway and Reading some lines are blocked. Train services running to and from these stations may be cancelled, delayed or revised. Disruption is expected until 15:00 17/02.
Customer Advice Replacement road transport has been arranged to operate in both directions between Reading and Didcot Parkway.
Last Updated:17/02/2020 14:36 Hard to tell how much disruption it's causing with all the other things going on but, certainly, causing some ripples up towards the Cotswolds.
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