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Old March 12th, 2011, 11:04 PM   #4421
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Single crossover? Why change it? What if they need the NB to SB crossover sometime?
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Old March 13th, 2011, 12:25 PM   #4422
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Single crossover? Why change it? What if they need the NB to SB crossover sometime?
Cost of maintenance, lots of crossovers have been removed over the years. It does make LU lines less operationally flexible unfortunately, bus this is balanced against reduced cost and risk of equipment failure.

Not too sure when the Piccadilly Circus 'scissors' were removed and replaced with the current single crossover. Even the single crossover was completely off limits for use until a recent replacement, as there was a derailment risk. Over August Bank holiday weekend 2008 (or was it 2009, I forget?!) the crossover was replaced with new 'house top' points, not found anywhere else in the UK. Even now it's only available for the SB platform - NB track move; the opposite move (detrain NB platform, shunt forwards, reverse back across into SB platform) still hasn't been commissioned yet.
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Old March 13th, 2011, 01:21 PM   #4423
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Uh-huh. I see. Looks like all the traffic companies in the world are using the same principal: anything to save a couple of bucks.

But how big was the risk for derailment? 1 out of 2 trains?
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Old March 14th, 2011, 12:27 AM   #4424
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Uh-huh. I see. Looks like all the traffic companies in the world are using the same principal: anything to save a couple of bucks.

But how big was the risk for derailment? 1 out of 2 trains?
Quite high, there had been a few at that point over the years, but usually engineers trains. There are issues with the track geometry due to the tight curves and constrained space of the crossover cavern.

The 'House top' points are designed to prevent derailment, the design was imported from US freight yards where they are common, Piccadilly Circus is the only UK example.
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Old March 14th, 2011, 06:40 PM   #4425
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I see. Thanks for the explanation.
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Old March 15th, 2011, 11:06 PM   #4426
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Quote:
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Uh-huh. I see. Looks like all the traffic companies in the world are using the same principal: anything to save a couple of bucks.

But how big was the risk for derailment? 1 out of 2 trains?
Not everything is about money. As Tubeman said (paraphrasing here) it does also reduce complexity which in turn can reduce incidents and delays. So it essense it is a balancing act between operational flexibility, cost and complexity.
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Old March 16th, 2011, 06:24 PM   #4427
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Yeah, but he also said that it was "to reduce maintenance costs".
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Old March 17th, 2011, 12:21 PM   #4428
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Yeah, but he also said that it was "to reduce maintenance costs".
One of MANY factors, that's the difference.
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Old March 17th, 2011, 01:49 PM   #4429
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Hey Tubes, will the third edition of London Railway Atlas show the new Thameslink track layout through Borough Market?
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Old March 17th, 2011, 04:51 PM   #4430
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A JLE question.
Northbound into Westminster station, there is a lighted passageway on the right hand side. Any idea what it is? Whenever I see a tunnel on the tube I get so inquisitive.
Thanks
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Old March 17th, 2011, 06:29 PM   #4431
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One of MANY factors, that's the difference.
Fine, you made your point. Now lets get back on topic.
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Old March 17th, 2011, 10:40 PM   #4432
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Fine, you made your point. Now lets get back on topic.
Who died and made you boss? Or do you not like being put in your place?
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Old March 18th, 2011, 02:54 AM   #4433
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Sad news today, District Dave passed away this morning while waiting for heart surgery. One of the most knowledgeable men on earth of London Underground, and one of the nicest guys you could ever wish to meet.
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Old March 18th, 2011, 02:55 AM   #4434
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Hey Tubes, will the third edition of London Railway Atlas show the new Thameslink track layout through Borough Market?
Yes, although maybe not precisely. Haven't seen any 'final' track diagrams yet, and it's likely too early for the finished layout to have been decided upon.
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Old March 18th, 2011, 02:57 AM   #4435
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A JLE question.
Northbound into Westminster station, there is a lighted passageway on the right hand side. Any idea what it is? Whenever I see a tunnel on the tube I get so inquisitive.
Thanks
There seems to be quite a few of these large dimly-lit caverns off the end of JLE platforms... I guess nothing more exciting than substations / signalling machine rooms.
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Old March 18th, 2011, 12:16 PM   #4436
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^Thank you. Sad news about District Dave too
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Old March 18th, 2011, 04:00 PM   #4437
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Sad news today, District Dave passed away this morning while waiting for heart surgery. One of the most knowledgeable men on earth of London Underground, and one of the nicest guys you could ever wish to meet.
Never knew Dave personally but visited his very informative website a few times. Such a tragic loss to the Underground community. RIP.
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Old March 18th, 2011, 07:17 PM   #4438
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Who died and made you boss? Or do you not like being put in your place?
No one. Just think we're done with this. And no i don't.

Quote:
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Sad news today, District Dave passed away this morning while waiting for heart surgery. One of the most knowledgeable men on earth of London Underground, and one of the nicest guys you could ever wish to meet.
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Old March 18th, 2011, 11:00 PM   #4439
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This has almost certainly been posted somewhere in the past 222 pages, but I don't' remember seeing it.

Detailed map of London Tube, Underground, Overground & DLR: Document non trouvé

And this from Wikipedia is nice and almost certainly has been posted

Derek

Last edited by nr23Derek; March 18th, 2011 at 11:11 PM.
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Old March 19th, 2011, 12:29 PM   #4440
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French for "Document not found".
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