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| Re: Northbound (2) train caught on fire @ 110 St station: 1 dead, 16 injured (Major service changes) (1541951) | |||
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Re: Northbound (2) train caught on fire @ 110 St station: 1 dead, 16 injured (Major service changes) |
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Posted by randyo on Sun Mar 29 17:00:36 2020, in response to Re: Northbound (2) train caught on fire @ 110 St station: 1 dead, 16 injured (Major service changes), posted by LuchAAA on Sun Mar 29 02:37:07 2020. The vacuum effect that you are referring to exists between 145 St and Dyckman on the Bway Line as well as between 149/G/Conc and 149/3. It also existed to a lesser degree in the entire original IRT subway. Under the dual contracts the problem was addressed to some degree by constructing curtain walls between opposing directions of traffic and in the case of the 4 Av and Center St BMT subways, even between each track. According to a PSC report I have from circa 1915, the air in the “first subway” was stirred up but never completely removed with the passage of the trains resulting in excessive heat in the tunnels. By separating the opposing directions, it was felt that the trains going in their respective directions would cause a sort of piston effect forcing old air out ahead of the trains and allowing fresh air to enter behind them, something not possible with trains of both directions in a completely open underground space. |
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