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Old January 21st, 2008, 11:42 AM   #101
_Night City Dream_
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Once again, I click it, but "We're sorry, this video is no longer available".
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Old January 22nd, 2008, 07:43 PM   #102
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Quote:
Originally Posted by iampuking View Post
Most metros/subways have no ballast when underground
I disagree -- most networks I`ve ridden use ballast underground.
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Old January 23rd, 2008, 12:53 AM   #103
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It seems the more modern don't use ballast, perhaps the advance in technology means trains can be smoother and quieter without needing ballast?
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Old January 24th, 2008, 07:54 PM   #104
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Quote:
Originally Posted by iampuking View Post
perhaps the advance in technology means trains can be smoother and quieter without needing ballast?
Me, I've yet to learn of any improvement of the past 40 years devised into any trackside acoustic muffler/board.....
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Old January 24th, 2008, 08:06 PM   #105
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Continuous welded rails spring to mind.
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Old January 26th, 2008, 07:20 PM   #106
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Quote:
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This is taken in 81-717 car. They were never been used on lines 3 and 4 and were used just for few month after opening on line l1. Anyway,
1. At 80kmph it will be noisy for sure because of narrow tunnel
2. Look at station, where train is stopped - the noise is keep going. It's a pure fake or just very badly normalized sound.

Just latest videos from new extension. It's noise and indeed because of rails needs some time to get polished well.

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Park Pobedy - Kuntsevskaya, line 3


Old Ezh train
Kuntsevskaya - Park Pobedy, line 3


You can hear - there is much less noise in old section (old revers sidings behind of park pobedy station).

Coth, I don't understand why the train goes directly from Park Pobedy to Kuntsevskaya?

The map below shows Peonerskaya, etc stations between the two. Did the train go on the express line?

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Old January 26th, 2008, 10:35 PM   #107
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http://www.skyscrapercity.com/showthread.php?t=567107
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Old January 27th, 2008, 09:26 PM   #108
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Quote:
Originally Posted by busdriver View Post
More data on SF BART:

...how loud is it? Bay Crossings decided to put a decibel (dB) meter on it and find out. Here is the result: On average straight track, BART runs around 70 dB; on curves, this can rise to 80 dB. Curved, elevated structures and tunnels are louder at around 82 dB. Three spots in the Transbay tube achieve an astonishing 95 dB, one lingering almost three minutes.
http://www.baycrossings.com/news_arc...mon=9&yea=2003
That's what happens when BART goes about 80 miles per hour in the transbay tunnel. The tunnel is about 7 miles long. I remember riding it few times. (this is for everyone to read, not just a response to you.)
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