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Post by snoggle on Feb 10, 2016 11:47:12 GMT
Interesting to see that the Commissioner [1] has just said that engineers have confirmed a noise problem between Walthamstow Central and Blackhorse Road and that further work is being done. The cause is the vastly higher number of trains moving across the line and the identification of new "hot spots" (probably associated with how ATO works). Seems something similar has happened at Archway (apparently residents have been waiting 2 years for rail grinding work to be done and have suffered severe noise issues). Mike Brown has also said LU is now going to look at possibly owning its own grinding train rather than using hired in vehicles. With either option there is an apparent issue with getting a rail grinder across the network and pointwork. If memory serves an old rail grinder had a tendency to "fall off" the rails.  [1] Appearing at a London Assembly Plenary session. Post moved from old thread by superteacher as a new thread is more appropriate for this discussion. |
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Post by edwin on Feb 14, 2016 22:15:26 GMT
So is the issue with higher number of trains causing the track to wear quicker and thus be more noisy, or is it just simply a case of more trains = more frequent noise when they pass?
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Post by snoggle on Feb 15, 2016 1:17:50 GMT
So is the issue with higher number of trains causing the track to wear quicker and thus be more noisy, or is it just simply a case of more trains = more frequent noise when they pass? From what was said (and I can remember) it seemed to be a combination of a) more train movements. b) ATO always causing trains to brake / accelerate in the same place concentrating wear (and thus noise) in specific areas. Drivers are rather more random in how they drive trains so rail wear is not so concentrated. When I was involved in some Journey Time Capability stuff and future ATO systems there was a clear understanding that you could get engineering issues arising from ATO systems and how they control train movement. This may on the rails but also on rolling stock but it takes time for things to emerge / become clear. c) there may be some specific issues at Walthamstow with the way the track was laid / rail insulation etc. I'd need to rewatch the webcast of the Assembly session to confirm the above and it's a bit late to be doing that right now.  |
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Post by crusty54 on Feb 15, 2016 7:34:20 GMT
67 stock was ATO so braking would have been in the same place every time but probably from a slower speed.
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Post by Chris M on Feb 15, 2016 10:03:05 GMT
67 stock was ATO so braking would have been in the same place every time but probably from a slower speed. And also possibly at a different place, given that the geometry of the crossover has changed. |
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class411
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Post by class411 on Feb 15, 2016 11:06:59 GMT
c) there may be some specific issues at Walthamstow with the way the track was paid / rail insulation etc. I always said this PPI nonsense was going to cause problems. |
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Post by snoggle on Feb 15, 2016 11:51:44 GMT
c) there may be some specific issues at Walthamstow with the way the track was paid / rail insulation etc. I always said this PPI nonsense was going to cause problems. Grump. Sassafrassarassum Rick Rastardly [1] fat finger typing errors.  [1] Muttley in case you hadn't guessed. |
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class411
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Post by class411 on Feb 15, 2016 12:38:47 GMT
I always said this PPI nonsense was going to cause problems. Grump. Sassafrassarassum Rick Rastardly [1] fat finger typing errors. [1] Muttley in case you hadn't guess. LOL, I've got a cold at the moment so I can do and ACE impression of Muttley's laugh - although at the expense of a minor coughing fit afterwards. |
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Post by vinnielo on Feb 21, 2016 10:09:33 GMT
I've noticed the stretch just as you leave Finsbury Park eastbound is particularly noisy.
Is this related in any way?
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Post by fish7373 on Feb 28, 2016 19:29:19 GMT
Heathrow loop on the picc line some times noisy going round it because one way round traffic the rail on one side that goes out of profile then they have to send in the rail grinder. FISH7373 81C NFP
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