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| Re: Myrtle Avenue subway station pic (1285370) | |||
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Re: Myrtle Avenue subway station pic |
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Posted by Randyo on Sat Apr 12 16:02:33 2014, in response to Re: Myrtle Avenue subway station pic, posted by Steve B-8AVEXP on Sat Apr 12 09:58:47 2014. The actual idea behind the curtain walls was to have trains in each direction renew the air in the subway envelope by a piston action forcing stale air out in front of the train and allowing "fresh" air to come in behind it. According to the pSC report on New Subways for New York, the first subway had no curtain walls at all and when trains passed, air was merely stirred up but not renewed. It was felt that by providing curtain walls between the N/B and S/B sides of the subway envelope, the air would be renewed rather than merely stirred up. Although in actual practice, curtain walls were provided only between the N/B and S/B sides, the 4 Av subway is unique in that it has curtain walls between all tracks, the only subway line in NY to have this arrangement. The consequent mitigating of the noise of passing express trains was only a colateral result of the walls being there and the stations S/O 36/4 didn't have them in the station areas themselves as the stations N/O 36 St did. |
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