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| Re: N to 96/2 (1426255) | |||
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Re: N to 96/2 |
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Posted by Stephen Bauman on Thu Feb 2 10:28:16 2017, in response to Re: N to 96/2, posted by Dyre Dan on Thu Feb 2 10:05:22 2017. why is a 1:1 ratio with the W important?It's to maintain a uniform headway for Brooklyn bound trains over a range of service levels. If the ratio is 1:1 a service pattern might look like: NWNWNWNWNWN. Remove the W at Whitehall and the Brooklyn bound trains look like: N N N N N N. Spacing between trains is still uniform. If the ration were 2:1 a service pattern would look like: NNWNNWNNWN. Remove the W at Whitehall and the Brookly bound traains look like: NN NN NN N. The uneven gap means the N before the gap gets fewer riders and the N following the gap get its share plus the gaps. This delays the train with its follower close behind. |
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