sweek wrote:
On 1 Aug, 04:53, David of Broadway
wrote:
Many lines have three tracks, although only a few actually have regular
service scheduled to run on the middle track. On the others, the middle
track is still available for scheduled and unscheduled reroutes.

How does that work, exactly?
I thought the third track was always used for express services in the
peak direction.

On some lines (the Flushing line, the Pelham line, the lower White
Plains Road line, the Concourse line, and part of the Broadway-Brooklyn
line), the middle track indeed carries express trains in the peak
direction, either rush hours only or also middays on weekdays. Other
lines (the West End line, the Sea Beach line, the Culver line, part of
the Broadway-Brooklyn line, both segments of the Upper Broadway line,
the upper White Plains Road line, and the Jerome Avenue line) don't have
any regularly scheduled express service, but the middle track is still
available if necessary - for instance, to run around a stalled train on
the local track or to allow for weekend track work on the local track.
--
David of Broadway
New York, NY, USA