paul7575
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« Reply #120 on: June 12, 2011, 11:47:36 » |
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The signalling on the East London Line, and currently being installed in the Thameslink core (Blackfriars to St Pancras inclusive) includes the new feature of Proceed on Sight Authorisation (POSA) aspects. This uses a pair of flashing whites below the main signal (same hardware as calling on lights) to allow drivers to proceed when there are problems with train detection only - but not when there are problems with points detection.
TBH▸ I can't see that POSA aspects would have helped in the recent problems. If someone damages signalling and/or power cables you lose control of the POSA aspects as well. Certainly - I was simply pointing out that there is a solution for loss of train detection only - resulting in red signals - one of the reasons for a scenarios dviner had just mentioned. Paul
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broadgage
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« Reply #121 on: June 20, 2011, 09:20:23 » |
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Unconfirmed reports suggest that this incident was NOT caused by the theft or attempted theft of cables as was initialy suggested. I heard that it was due to the failure of a cable in a substation near Farnborough. It was a return traction current cable, the failure of which led to excessive voltages between true earth and the nominaly earthed running rails, which caused widespread signalling problems.
I am not able to give a source for this. Can anyone confirm or deny ?
P.S. if true, it shows the unwisdom of touching ANY rail on an electric railway. I suspect that running rails would have been at a dangerous voltage .
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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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IndustryInsider
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« Reply #122 on: June 20, 2011, 09:23:39 » |
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Maybe those regulations need looking at?
Otherwise you'll get people frying themselves.....
Was it not far worse back in day - not that long ago - when there were no locked doors preventing people from hopping down onto the tracks?
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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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ChrisB
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« Reply #123 on: June 20, 2011, 09:37:32 » |
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Yet no one did it - because communications to passengers wasa better & there were very very few 3+ hour delays. Health & Safety rules were minimal (comparted to today) too....
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Electric train
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« Reply #124 on: June 20, 2011, 20:27:39 » |
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Unconfirmed reports suggest that this incident was NOT caused by the theft or attempted theft of cables as was initialy suggested. I heard that it was due to the failure of a cable in a substation near Farnborough. It was a return traction current cable, the failure of which led to excessive voltages between true earth and the nominaly earthed running rails, which caused widespread signalling problems.
I am not able to give a source for this. Can anyone confirm or deny ?
P.S. if true, it shows the unwisdom of touching ANY rail on an electric railway. I suspect that running rails would have been at a dangerous voltage .
I can assure that the information given to you is not wholly correct. It was not a cable failure as such it was an attempted theft one of the cables attacked was a high voltage cable. The damage caused a wide spread high voltage system failure, signaling power supplies are derived from the high voltage traction system. This incident still subject to a Police investigation therefore only limited details.
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Starship just experienced what we call a rapid unscheduled disassembly, or a RUD, during ascent,”
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broadgage
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« Reply #125 on: June 21, 2011, 06:33:36 » |
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Thanks for the correction, it was an unsubstantiated report from someone working on the repairs, though perhaps not a technical person.
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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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Not from Brighton
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« Reply #126 on: June 21, 2011, 19:53:45 » |
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How much effort goes into making these systems resilient to these sorts of failures? They do seem to be quite vulnerable to the actions of a few individuals. There was a case in the west midlands a few years ago where somebody with a grudge and a bit of knowledge was able to inflict numerous crippling delays over a long campaign of sabotage and there was little the railway could do about it. Would it be very expensive to have backups, redundancy etc? Who would pay?
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Electric train
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« Reply #127 on: June 21, 2011, 21:25:11 » |
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How much effort goes into making these systems resilient to these sorts of failures? They do seem to be quite vulnerable to the actions of a few individuals. There was a case in the west midlands a few years ago where somebody with a grudge and a bit of knowledge was able to inflict numerous crippling delays over a long campaign of sabotage and there was little the railway could do about it. Would it be very expensive to have backups, redundancy etc? Who would pay?
There is redundancy built in, electrification works on a N - 1 that is we can lose one piece of equipment of supply without having an impact on normal operation, although one of the items attacked here is not N - 1 as it is over 50 years old and when installed the failure of it was view differently, this type of equipment is high on the list to be renewed to an N - 1 but does take time and money A lot of effort goes into protecting modern equipment and systems by overt and covert methods, it is very difficult to protect a network as large as the railway system from deliberate attack
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Starship just experienced what we call a rapid unscheduled disassembly, or a RUD, during ascent,”
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Electric train
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« Reply #128 on: July 23, 2011, 18:05:07 » |
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Revisiting this thread as the case has come to Court. Three men had broken into the remote track-side substation between Penge West and Sydenham to steal the copper strips at 5.30 one morning last December, but in the raid one of the three a 28 year old male was electrocuted and one was seriously burned; the 2 surviving men have admitted burglary and a charge of criminal damage, recklessly endangering life. 1 has also pleaded guilty to perverting the course of justice. http://www.thisislondon.co.uk/standard/article-23972252-railway-cable-thieves-fled-as-accomplice-was-electrocuted.doHopefully they will get a long sentence and BTP▸ make the most of this case to publicise the dangers of stealing copper from electrical substations
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Starship just experienced what we call a rapid unscheduled disassembly, or a RUD, during ascent,”
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tramway
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« Reply #129 on: July 25, 2011, 00:19:14 » |
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Do you only qualify for a 'Darwin' if you don't already have progeny? I suspect that idiot already has several who will carry the 'metal theft' gene.
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broadgage
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« Reply #130 on: July 25, 2011, 13:51:04 » |
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Very little sympathy for the victim or those that witnessed his death.
I also have no sympathy for the thief, got what he deserved. As for those that witnessed it, if they were also engaged in the theft, then I have no sympathy for them either. I would however have sympathy for any inocent persons who saw it, and for those clearing up.
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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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RichardB
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« Reply #131 on: August 17, 2011, 11:51:59 » |
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Self explanatory......I've already signed. Morning All, If you could find time to sign this petition it could help reduce the thousands of delay minutes a year, caused by people stealing our cable and putting signalling systems out of order. (most recently 518 delay minutes were caused and 8 trains cancelled by one theft on Monday). To sign just follow this link http://epetitions.direct.gov.uk/petitions/406Please feel free to pass it on. Thanks for your help Mike Mike Franklin Community Rail Executive Network Rail.
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ChrisB
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« Reply #132 on: August 17, 2011, 11:55:26 » |
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signed - makes sense
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anthony215
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« Reply #133 on: August 17, 2011, 12:14:32 » |
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Signed this after hearing about it on WNXX▸ .
This is actually a good idea
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Electric train
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« Reply #134 on: August 17, 2011, 18:32:39 » |
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Signed it too, having dealt with an incident where a thief electrocuted himself and having to resolve almost on a daily bases the problems caused by metal thieves, I just hope the Cameroons have the nerve to pass the legislation
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Starship just experienced what we call a rapid unscheduled disassembly, or a RUD, during ascent,”
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