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Mysterious Canarsie Platform - Possible Answer (Ventilation Room)

Posted by R46 5636 on Sat Jun 18 17:08:38 2022, in response to Re: Subway Themed Playground - Re: Question About the “L” BMT line, posted by K. Trout on Sat Jun 18 13:52:05 2022.

Whoa, I must've been tired enough to not realize the video was heading towards 8/14th, not Canarsie. Me thinking the curve leaving the previous station was after Montrose to Morgan, not leaving Jefferson to Morgan the other way.

Did a little more searching on maps. The Emergency Exit just past this mysterious platform made it much easier to pinpoint where this exact spot is;

It seems the ventilation grates on the street align exactly above where this room / platform is. This is the most likely answer - the platform is simply a ventilation room.

Checked historicaerials.com and wanted to say it had something to do with the former LIRR branch storing trains on the site where the building is today just past the curve leaving Jefferson heading Manhattan bound where both tunnels run directly under. The mystery platform isn't exactly where this building / former storage yard is, yet just past it right below where ventilation grates appear in the sidewalk. For both sides though, and it isn't clear in the video if the opposite direction also has one of these rooms.

What IS interesting to note is there is a very long ventilation room just another block over closer to Jefferson station on the Canarsie-bound side. I've seen this mysterious long corridor when looking out the side of a Canarsie train, blurring past very quickly. On Gmaps shows the ventilation grates at a 90° angle to the tunnels right along Stewart Street.

Reminds me of that mysterious long passageway just before 5/59th going SB on platform level. Visible just before entering the station.


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