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Post by mcmaddog on Nov 21, 2015 11:29:48 GMT
I've noticed over the past few months that the motor noise seems to change at Waterloo. West of waterloo it's the normal relatively quiet sound when at speed, East of Waterloo it's quite a loud electrical whistling sound similar to being on a Pendolino.
Was it always thus or has something changed this year?
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Deleted
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Post by Deleted on Feb 18, 2016 1:22:55 GMT
I've actually noticed a distinctly new motor noise in my part of the Jubilee line (Bond Street to Finchley Road) in the last two weeks.
It is interesting to know why - anyone knows?
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Post by mcmaddog on Feb 18, 2016 8:34:58 GMT
Alex, yes agreed, I noticed it change about two weeks ago and it's now really clear between Green Park and Bond Street. As the train leaves Bond Street you can hear a real growl too.
I still have no idea what it is though.
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Deleted
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Post by Deleted on Feb 18, 2016 13:37:22 GMT
Weren't there engineering works along those tunnels over the past 12 months? Perhaps it changed the acoustics.
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Post by domh245 on Feb 18, 2016 14:44:04 GMT
It may just be the railheads. I know that they did some railhead grinding on the Wimbledon branch a while back and the trains sounded noticeably different.
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Post by will on Feb 18, 2016 15:06:17 GMT
Has there been any ATO modifications that have caused the trains to brake/accelerate more rapidly or cause the trains to coast more? That may have changed the noise of the trains.
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Post by Dstock7080 on Feb 18, 2016 18:14:38 GMT
It may just be the railheads. I know that they did some railhead grinding on the Wimbledon branch a while back and the trains sounded noticeably different. Indeed, last weekend the whole District Line from Whitechapel to Upminster had the grinding machines working both tracks, so the track noise distinctly changed on Monday. |
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Deleted
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Post by Deleted on Feb 18, 2016 19:37:23 GMT
It may just be the railheads. I know that they did some railhead grinding on the Wimbledon branch a while back and the trains sounded noticeably different. Indeed, last weekend the whole District Line from Whitechapel to Upminster had the grinding machines working both tracks, so the track noise distinctly changed on Monday. The noise from the District line after this weekend is remarkably loud and noticeable now along this section, you can hear the trains passing at quite a distance. I can imagine it is very loud in a tunnel if the same is done on the jubilee. |
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Colin
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My preserved fire engine!
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Post by Colin on Feb 18, 2016 20:34:11 GMT
I bet the local residents either side of the railway are well impressed....
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Deleted
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Post by Deleted on Feb 23, 2016 22:10:58 GMT
Well, it's definitely not the track. I heard the new motor noise on the entire line from Neasden to Stratford now; and all the train have it.
Was it some kind of train firmware update? :-)
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Post by Hassaan on Mar 10, 2016 20:18:47 GMT
I'm certain it is rail grinding. It appears to have been done between Baker Street and Southwark in the last few days. It sounds like a loud version of the old DC motors and can clearly be heard in the trailer cars too, and disappears once away from that section of line, which is why I'm sure it is rail grinding and not something done to the motors.
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Post by marri260 on Mar 11, 2016 4:16:01 GMT
It is down to rail grinding, that is all. A noticeable difference though yes.
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