Deleted
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Post by Deleted on Jan 19, 2011 20:18:29 GMT
So why was the central line closed for the last two weekends between Holborn and White City? I know it's engineering works, but exactly what?
Also when the trains leave and enter Holborn to reverse, do they run in RM or CM?
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Post by superteacher on Jan 19, 2011 20:52:21 GMT
They run from Holborn in CM. Don't know what the engineering work was - but like a lot of people I thought that the line was supposed to have been fully upgraded in the 90's, Yet we still see closures for works!
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Deleted
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Post by Deleted on Jan 19, 2011 20:55:00 GMT
Points replacement on the eastbound at Marble Arch, the first weekend for the removal on the old ones and the second weekend to install the new point work. All the shunt moves at Holborn are done in Coded Manual (CM).
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Post by superteacher on Jan 19, 2011 21:09:42 GMT
Hopefully thry will increase the speed into Marble Arch eastbound now that the points have been changed.
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North End
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Post by North End on Jan 19, 2011 21:21:40 GMT
They run from Holborn in CM. Don't know what the engineering work was - but like a lot of people I thought that the line was supposed to have been fully upgraded in the 90's, Yet we still see closures for works! This is the trouble with the way things are done on LU nowadays. Everything has to be a glitzy "upgrade" or "investment". All infrastructure assets require ongoing maintenance to a greater or lesser degree, and over time some assets will reach the end of their working life and require replacement. Unfortunately because of the overuse of the word "upgrade" people have been conditioned to thinking this is the answer to all problems, which it isn't. |
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Deleted
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Post by Deleted on Jan 19, 2011 21:36:18 GMT
Once the points where removed, did they just put in a straight section of track to return it back to service?
Or are the points not actually on the running track.
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Deleted
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Post by Deleted on Jan 19, 2011 22:10:40 GMT
Points at Marble Arch are for the siding... removal of these would be utter idiocy. Hence, replacement.
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Tom
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Post by Tom on Jan 19, 2011 22:25:31 GMT
I'm not sure where some of you have got your sources from, but as the designer for some of the work, perhaps I can shed some light?
Renewal of points in the tunnel sections was not carried out during the 1990s resignalling, other than a single set at Marble Arch on the WB. Any pointwork that was renewed at resignalling was part of remodelling.
The old points were not completely removed during the first weekend - only four bits of rail to the siding were taken away to make the lives of the P/Way engineers slightly easier, and the points themselves were secured for through running on the EB and WB.
There is no possibility of increasing the speed into Marble Arch EB platform without serious realignment and tunnelling works; in fact the existing alignment is slightly deficient to LU Standards as it is today in terms of the effects of curvature at Maximum line speed, mainly due to the tightness of the tunnel.
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Post by plasmid on Jan 19, 2011 23:40:30 GMT
Since you know the Central Line has already been upgraded gradually from the early 90's, the only thing that remains is track replacement.
If you look on YouTube you can find a video of people doing track replacement on the Central Line and this was recorded no longer than a year or two ago.
EDIT - Even better...
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Post by norbitonflyer on Jan 20, 2011 10:03:25 GMT
They run from Holborn in CM. Don't know what the engineering work was - but like a lot of people I thought that the line was supposed to have been fully upgraded in the 90's, Yet we still see closures for works! This is the trouble with the way things are done on LU nowadays. Everything has to be a glitzy "upgrade" or "investment". All infrastructure assets require ongoing maintenance to a greater or lesser degree, and over time some assets will reach the end of their working life and require replacement. Unfortunately because of the overuse of the word "upgrade" people have been conditioned to thinking this is the answer to all problems, which it isn't. Closures are usually announced to be for "essential engioneering works". Is that first word needed? - I can't imagine anyone would imagine TfL would want to do (or at least admit it was doing) any unnecessary work! |
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Post by edwardfox on Jan 20, 2011 10:30:11 GMT
Perhaps the word is used to emphasise the fact that if the work was not done urgently, the service (to the public) would need to be suspended for safety reasons. Routine engineering work (maintenance) is less of a priority
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Post by superteacher on Jan 20, 2011 12:16:53 GMT
There is no possibility of increasing the speed into Marble Arch EB platform without serious realignment and tunnelling works; in fact the existing alignment is slightly deficient to LU Standards as it is today in terms of the effects of curvature at Maximum line speed, mainly due to the tightness of the tunnel. I only mentioned this because the 1962 stock used to come into the eastbound platform at a much higher speed than the 1992 stock do now! |
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Post by norbitonflyer on Jan 20, 2011 13:46:42 GMT
Perhaps the word is used to emphasise the fact that if the work was not done urgently, the service (to the public) would need to be suspended for safety reasons. Routine engineering work (maintenance) is less of a priority ....but they use "essential" for routine work. If it's not scheduled it's "emergency" engineering work! |
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Deleted
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Post by Deleted on Jan 20, 2011 15:19:18 GMT
This is the trouble with the way things are done on LU nowadays. Everything has to be a glitzy "upgrade" or "investment". All infrastructure assets require ongoing maintenance to a greater or lesser degree, and over time some assets will reach the end of their working life and require replacement. You are quite correct. From the financial world we see the misuse of this term straight away. "Investment" is adding to the capital value of your business. Building Crossrail is an investment. However replacing escalators or rails, which have a finite life, and describing this as "investment" is a gross error that would never be allowed in the TfL accounts. This is "Repairs and Renewals", or similar, and is handled quite separately in the accounts of a business (won't give the technical details - far too boring). There is particular provision for replacing something which has some new additional features. For example, if you replace old trains with new, but the new ones have air conditioning, you will get away with the cost of the air conditioning, alone, as investment. The Beancounters have been at this for a long time, so the various rules are complex but should be well understood by those whose day job is doing all this. Now then, back to my beans ......... |
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Chris M
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Post by Chris M on Jan 20, 2011 15:40:32 GMT
However (and probably fortunately) TfL's beancounters and TfL's publicity department are not the same people.
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Deleted
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Post by Deleted on Jan 20, 2011 20:44:52 GMT
Points at Marble Arch are for the siding... removal of these would be utter idiocy. Hence, replacement. Sorry, perhaps I didn't make my question clear. Are the points being replaced in the sidings, or are they points that join the siding to the main running tracks. I ask this because it's been said that the points are removed one week, the line goes back into service then new ones going in next week. If the points removed connect the main line to the siding that means there would be a gap in the track. Sorry if I'm missing stuff or asking stupid questions or whatever. Hope you understand what I mean! lol |
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