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| Re: Middle Village and Maspeth NIMBYs come out to oppose IBX (1645223) | |||
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Re: Middle Village and Maspeth NIMBYs come out to oppose IBX |
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Posted by Stephen Bauman on Sat Nov 15 12:16:38 2025, in response to Re: Middle Village and Maspeth NIMBYs come out to oppose IBX, posted by piyer on Sat Nov 15 10:08:41 2025. I attended Brooklyn College in the 2008 to 2010 window. Pulling into the Flatbush Ave terminal in the morning, trains were often delayed due to traffic.A couple factors combine to create congestion at terminals. Generally, stub terminals should be able to handle 15 tph. This us due to the time it takes trains to clear the interlocking ahead of the station. The interlocking must handle trains in both direction or 30 tph. It takes about 1 minute for a train to clear the interlocking. If trains arrive at the interlocking every 2 minutes (30 tph), then a sufficient condition to eliminate switching conflicts is to schedule trains to arrive every 2 minutes and to ensure that all trains are within 30 seconds of their scheduled arrival. Unfortunately, MTA schedules are precise the nearest 30 seconds. They need to write schedules with 1 second precision. The second problem is that the MTA increased scheduled running time to "improve" end-to-end on time performance. Trains travel faster than the published schedules. The result is that trains arrive at terminals well before their scheduled arrival time. Outgoing train departures are written according to the scheduled arrival time. The real world result is that early arriving trains must wait until the outgoing train leaves according to the padded schedule. Like Second Avenue is supposed to help the 4/5/6 in Manhattan. Actually it was the reverse. The MTA created crowding on the Lex to justify building the SAS. I discussed how this was accomplished in a this previous post. http://www.subchat.com/read.asp?Id=1645092 |
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