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Post by jonathanburg on Feb 10, 2023 22:00:50 GMT
Interesting info. I wonder whether it's been passed to the TfL/LUL specialists. Customer service suggest so, but I don't think they communicate with technical folk 100% well, if so it will be a partial story in/partial diagnosis out. Another thought is whether track lubrication systems fire on a set schedule or simply need to oil things a little more often. |
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Post by cudsn15 on Feb 11, 2023 9:09:36 GMT
For the record - today (Saturday 09:00) can barely hear Victoria line trains below me. no explanation why they were so loud about the same time yesterday and not today...
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Post by d7666 on Feb 11, 2023 10:03:49 GMT
For the record - today (Saturday 09:00) can barely hear Victoria line trains below me. no explanation why they were so loud about the same time yesterday and not today... Just a guess. See if you can determine if noise level is related to headways - does it occur when trains are bunched ? If you not staff then you won't have trackernet, but traintimes.org.uk/map/tube/might help 0900 yesterday is peak, 0900 today is not. Sound transmission varies with air pressure. Bunched trains may alter pressure in the tunnels. So whatever noise thee is maybe transmitted differently. Just a theory. |
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Post by zbang on Feb 11, 2023 17:44:26 GMT
Air pressure and humidity, however compared to the mass of the tunnel and earth it probably hardly makes a difference.
Also just a theory.
Throwing out wacky ideas- any correlation with the tides and ground water level?
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Post by jonathanburg on Feb 11, 2023 18:18:48 GMT
Do the trains run on banded speed settings.
If the timetables are the same every day then necessarily with more loading there will need to be enough extra speed to compensate for longer loading/discharging of passengers.
I wonder if that is being directed into the automated operation after a loading review, which would account for the noticeable rampup and rampdowns (depending on which decision is made)?
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Tom
Administrator
Signalfel?
Posts: 4,054 
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Post by Tom on Feb 11, 2023 20:51:44 GMT
I'm not sure how much the Victoria line can vary speeds these days, but it's not inconceivable that there are a range of 'standard' speeds.
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Post by xtmw on Nov 11, 2023 20:13:24 GMT
Bump!
I took a journey on the Central and Victoria lines today, both of which are very noisy. Although that is not my point.
There used to be a very loud noise upon approaching Bethnal Green EB (just before the crossover), has this section had it's track renewed?
Thanks in advance
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