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| Re: Underbuilt IND? (1139826) | |||
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Re: Underbuilt IND? |
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Posted by R36 #9346 on Wed Feb 15 13:43:50 2012, in response to Re: Underbuilt IND?, posted by Forest Hill Rider on Wed Feb 15 10:37:13 2012. Interesting idea, but the line is not signaled for bidirectional operation on D3 and D4.The other thing to consider is what to do when the main line splits off into two-track lines for 53rd, 60th, 63rd, and Crosstown. That would most likely require single-track operation for a portion of each two-track section. Given the current track layout, it would definitely include a station somewhere. Consider the following service pattern, with an E/F terminal swap and local service extended to the eastern terminals as follows: E PDX between 179th Street and Lexington/53rd F PDX between Jamaica Center and Roosevelt Island R local between Jamaica Center and Lexington/60th M local between 179th Street and Lexington/53rd Also assume the signal system is modified to allow bidirectional operation on D3 and D4. For all peak hours, the local services would be simple. The M would use D1 and D2 along the entire stretch between Queens Plaza and 179th Street, and D3 and D4 between Queens Plaza and Lexington/53rd. The R would use D1 and D2 between Queens Plaza and Briarwood, and D1A and D2A to Jamaica Center. For the morning peak... The Jamaica-bound F would use T2 from Roosevelt Island to 36th Street, D2 from 36th to Briarwood, then D2A to Jamaica Center. The Manhattan-bound F would use D1A at Jamaica Center, switch to D2A at Jamaica-Van Wyck, use D4 between Briarwood and 36th Street, then use T2 between 36th Street and 21st Street, switching to T1 at 21st Street. The Jamaica-bound E would use D4 between Lexington/53rd and Queens Plaza, then D2 to 179th Street. The Manhattan-bound E would use D3 between 179th Street and Lexington/53rd. And the evening peak... The Manhattan-bound F would use D1A from Jamaica Center to Briarwood, D1 from Briarwood to 36th Street, then T1 from 36th to Roosevelt Island. The Jamaica-bound F would use T2 between Roosevelt Island and 36th Street, D4 between 36th and Briarwood, and D2A between Briarwood and Jamaica Center. The Manhattan-bound E would use D1 between 179th and Queens Plaza, then D3 to Lexington/53rd. The Jamaica-bound E would switch to D3 at 23rd-Ely, and continue on that to 169th Street. In the morning peak, the conflict points would be between 36th Street and 21st-Queensbridge, and between Jamaica-Van Wyck and Briarwood, where T2 and D2A are used for trains of both directions. In the evening peak, D3 between 23rd Street and Queens Plaza, including both stations, would be used for conflicting bidi service. In short, the idea won't work. |
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