Quote:
Originally Posted by ajiuO
SF has both BART and MUNI. They both run under ground on the main part of market street but are actualy above ground quite a lot.
I'm glad someone brought SF up... They should be an example for any city.
There is no reason this can't be managed... Even if they need to add 2 blocks of track to take the stress of a single intersection... Which I don't think they would need to do.
|
It's not the tracks that can't handle the train traffic! It's the streets that the tracks cross that can't! And there's far more than just one intersection in any central business district!
DART in Dallas has similar problems as UTA in its downtown area because they run trains at grade on city streets. DART presently run four lines down one pair of tracks. That effects the headways between trains on every line. Each line can have headways of 10 minutes, not less, to maintain headways of 2.5 minutes where all four lines join. Half the time the cars, bikes, pedestrians, and trucks crossing the tracks get the right-of-way because of the interlocal agreement DART has with the city to run the trains on city streets. Without making slots for the other city traffic, DART could run more trains over the same tracks.
If DART wanted to run shorter headways between trains on some of the rail lines, one or more lines would have to be pulled from the central shared tracks downtown. DART is presently planning a second rail corridor downtown so that shorter headways in the future can be achieved. And that's the same reason why UTA doesn't run every line on the same tracks downtown - to keep shorter headways for every line.
San Francisco trains, BART & Muni, don't run in city streets downtown. It's a subway completely avoiding other city traffic on city streets. Dallas and Salt Lake would have to replace the tracks running within city streets downtown with an aerial guideway or subway before any fair direct comparisons on train operations could be made with San Francisco.
UTA could run all four lines over the same tracks in downtown Salt Lake City if they wanted, but that would require longer headways on each line. You got to keep other city traffic moving in a central business district. Who would want to work, live, or play in any downtown district if you couldn't even cross the street safely because there was a constant stream of trains?