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Re: Increase in L train service

Posted by Stephen Bauman on Sat Jun 9 14:58:25 2012, in response to Re: Increase in L train service, posted by Easy on Sat Jun 9 13:24:44 2012.

Although $1.7 million per year is fairly cheap as it is. Can they eventually run 30 tph?

It's going to take a lot more money to operate more than 24 tph.

There are two parameters that determine a line's service level capacity: terminal capacity and intermediate station capacity. Terminal capacity is usually the more stringent of the two. One way around this is to have the line branch out at both ends.

The capacity for non-loop terminals is determined by the distance between the crossover switches and the platform and the speed by which trains can enter the station. There other factors such as speed to change the switches. Nominal capacity for a stub end terminal with the crossover close to the platform is around 20 tph. Adding overrun tracks will increase this to 40 tph. Increasing the distance from the platform to the crossover to 300 feet will reduce the capacity to 12 tph.

Intermediate station capacity is nominally 40 tph. However, stations spaced too close to one another or speed restrictions at station entrances or exits will reduce this number.

To get around the capacity restrictions of the 8th Ave terminal, the least expensive solution would be to make 6th Ave an alternate terminal. This would require adding a switch west of the 6th Ave station. There are 3 tracks between 6th and 8th Avenues. Access to the center track is only from 8th Ave. Providing access to this track from 6th Ave should not require any structural work to the tunnels.


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