Keith Keller <
kkeller...@wombat.san-francisco.ca.us> writes:
> On 2013-06-18, Peter Lawrence <
humm...@aol.com> wrote:
>> One of the advantages of the new cars (if they do what's shown) is that each
>> car will have an extra set of doors, making ingress and egress a whole lot
>> easier and faster. That should help speed up the schedule as a whole too,
>> especially during the rush hours.
>
> It'll definitely help boarding, but IIRC the Tube itself is basically at
> capacity with BART's current control system. So they won't be able to
> add more trains, though perhaps they will be able to better stay on
> schedule.
My understanding is that the Market St. stations are more of a
bottleneck than the tube. The trains have to stop and let people in and
out for 2 minutes at least. That means trains in the tube can't run
less than 2 minutes apart. If the extra door per car means they can run
the trains through the tube 90 seconds apart, it'll add capacity.
The earliest designs for BART called for four tracks under Market St.,
using both levels. Then to save money BART decided to turn over the
upper level to MUNI. It makes transfers easier, but now that BART is
near capacity it limits their options.
-- Patrick