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Author Topic: Cable fire cancels all trains at Marylebone (15/06/2014)  (Read 15652 times)
ChrisB
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« Reply #15 on: June 16, 2014, 07:53:28 pm »

Thanks, Chrisfn
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grahame
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« Reply #16 on: June 16, 2014, 08:43:09 pm »

Quote
Central Line: No service between Liverpool Street and North Acton, westbound only, while we fix a faulty train at White City. Tickets will be accepted on local bus services. A GOOD SERVICE is in operation on the rest of the line.
This Information will apply from 16/06/2014 20:33 to 16/06/2014 23:33.
This will affect journeys
from 16/06/2014 20:33 to 16/06/2014 23:33.

Isn't that on the way to West Ruislip?
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« Reply #17 on: June 16, 2014, 10:16:42 pm »

Ouch. Indeed it is.

Odd they are terminating at North Acton as I was under the impression it was not bi-directional in the direction of Ealing Broadway/Ruslip.
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« Reply #18 on: June 16, 2014, 10:21:01 pm »

There were problems yesterday on the Underground and Chiltern had to lay on coaches for a while.
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bobm
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« Reply #19 on: June 17, 2014, 07:01:28 am »

Marylebone has reopened this morning and a normal service is expected to operate.
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ChrisB
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« Reply #20 on: June 17, 2014, 11:28:35 am »

Now we await the report from Network Rail as to why cables carrying little or no current caught fire...
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bignosemac
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« Reply #21 on: June 17, 2014, 06:48:11 pm »

I'd've though the current would actually be quite high due to the length of cable between installations. You need a relatively high amperage to counter the voltage drop over distance. I believe the voltage rating for signalling cables is 650/1100v.
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« Reply #22 on: June 17, 2014, 07:09:49 pm »

I'd've though the current would actually be quite high due to the length of cable between installations. You need a relatively high amperage to counter the voltage drop over distance. I believe the voltage rating for signalling cables is 650/1100v.

Errrrrrrrrrrrr no quite right

Signal power supply is 650V although there are some systems the use 400V there are supply points that step this down to the local power used by the signalling equipment typically this is 110V there are other low voltages.

The higher voltage of 650V is used to over come the volt drop due to the resistance of the feed cable, the current in the cable is a product of the load it is supplying and is driven by the EMF (Voltage)

Any cable carrying current produces heat, this becomes a problem if the cables are incorrectly sized or the protective device (fuse) is to big for the cable.

Could the damage caused by this fire been due to litter catching light or a deliberate act of vandalism, signalling Locs catching fire has happened in third rail areas due to traction bonding problems causing traction current to flow through signalling equipment but this is a non electrified area. 
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« Reply #23 on: June 17, 2014, 08:05:56 pm »

Could cable overheating also have been caused due to kinking, crushing or damage to the insulating/protective material resulting in corrosion? They all have the potential to increase electrical resistance and therefore heat.
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« Reply #24 on: June 17, 2014, 08:29:49 pm »

Could cable overheating also have been caused due to kinking, crushing or damage to the insulating/protective material resulting in corrosion? They all have the potential to increase electrical resistance and therefore heat.
Possible it would need another failure mode to be present, incorrect fuse rating, an earth fault elsewhere that had been ignored.   The chaos in London Bridge Signal Box about 6 months ago was due to a transformer over heating due to excessive load and poor ventilation
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« Reply #25 on: June 18, 2014, 12:16:57 pm »

I heard comment that diesel had been dropped & caught fire....no idea how true....but is that possible?
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ChrisB
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« Reply #26 on: June 18, 2014, 12:19:26 pm »

Wasn't *just* a 2 metre length of cable then....
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« Reply #27 on: June 18, 2014, 06:38:35 pm »

Wasn't *just* a 2 metre length of cable then....

The cable trough length might have been a 2 metre, you can get a lot of cables in a trough
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« Reply #28 on: June 18, 2014, 06:44:51 pm »

If you check the first photo, no troughs involved...
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