Service Disruption Last Night (07/19/19)

Discussion relating to the past and present operations of the NYC Subway, PATH, and Staten Island Railway (SIRT).

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rspenmoll
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Service Disruption Last Night (07/19/19)

Post by rspenmoll » Sat Jul 20, 2019 5:58 pm

I'm just curious. Why was the Flushing Line unaffected by the signal system issue that suspended service on all the other IRT lines?

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GirlOnTheTrain
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Re: Service Disruption Last Night (07/19/19)

Post by GirlOnTheTrain » Sun Jul 21, 2019 12:15 am

Because it was an ATS-A failure, the 7 line uses CBTC, and the systems have nothing to do with each other. The 7 line is its own little oddity - not quite A division, not quite B division. Even prior to CBTC coming online, the 7 operated more like a B-division line than an IRT line.
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Backshophoss
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Re: Service Disruption Last Night (07/19/19)

Post by Backshophoss » Sun Jul 21, 2019 1:25 am

With the Record Heat wave in the NE US,Con-Ed's Grid is failing and falling apart,substations are failing due to record demand,
that can effect traction power or signal power on different sections of the Subways,depending on where the feeds are located.
Wonder if "Big Allis" generating station is still active?
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dieciduej
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Re: Service Disruption Last Night (07/19/19)

Post by dieciduej » Sun Jul 21, 2019 5:14 am

I am not sure of the electrical situation in New York City but one of the major issues in the Boston area is line capacity.

You may have all the generation capacity you could ever want but the transmission lines from the generation station, via substations, to your apartment may not. We are going through a building boom here and attaching these new buildings into existing wiring. Sort of how many microwave ovens, toasters and coffee makers can I plug into that one kitchen outlet. Existing wiring could be of 1940s vintage and of limited capacity.

The solve would be adding more wiring, paralleling, to increase capacity and more sectionalization to isolate problems to a smaller area. The problem is cost and people. Most of the electrical utilities are underground and existing conduit is already filled so rip up the streets for more, adding more substations would help no one want to live next to a sub. There is a cost to having all our electronic gizmos.
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rspenmoll
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Re: Service Disruption Last Night (07/19/19)

Post by rspenmoll » Sun Jul 21, 2019 2:35 pm

GirlOnTheTrain wrote:
Sun Jul 21, 2019 12:15 am
Because it was an ATS-A failure, the 7 line uses CBTC, and the systems have nothing to do with each other. The 7 line is its own little oddity - not quite A division, not quite B division. Even prior to CBTC coming online, the 7 operated more like a B-division line than an IRT line.
I see. if it's not too much trouble to explain, what is the reason that the Flushing line has operated more like a B-division line as you mentioned?

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GirlOnTheTrain
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Re: Service Disruption Last Night (07/19/19)

Post by GirlOnTheTrain » Sun Jul 21, 2019 5:32 pm

Once upon the time the BMT had trackage rights on that line, and you can still move equipment between the A & B at Queensboro. For example, when the 7 went 100% R188, the R62s on the 7 went to the 6. They gotta get off that line somehow - it's a convoluted move, but it can be done.

Fun fact: the station booths on the Astoria Line between Queensboro Plaza and Ditmars Boulevard are numbered with IRT numbers, despite the fact that it's a BMT line, because until 1949 the line was operated jointly between the BMT and IRT with IRT equipment...and here we are 70 years later 😂

Prior to CBTC control on the 7, the line ran with local tower control like the B division still does.
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