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Originally Posted by Nexis4Jersey
Why does this line need to go past Dulles ? And why couldn't they build a branch of the MARC Brunswick line , which would have been cheaper & faster. The DC region seems think Metrorail is the answer to everything , when Regional Rail is the better option.
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How would a branch of the MARC Brunswick line get to Dulles Airport?? Besides crossing the Potomac river, figuring out a viable ROW south to Dulles would be a doozy. And a very round-about way to get to Dulles from downtown DC.
By building a Metro line out to Dulles airport, it becomes an integrated part of the Metro system with a one seat ride from the current Orange-Blue line downtown stations, Rosslyn-East Falls Church, Tysons Corner, Reston, and Herndon. But, just as important, downtown DC, Arlington, and Tysons Corner are now a Metro ride from Reston, Herndon and Ashburn, along an axis which has seen considerable development and growth over the past 20 years.
As for extending the line past Dulles Airport, I think part of the reason is that the maintenance and storage yard had to be located on the NW edge of the Dulles airport complex because that was the available space to put it. Since the trains have to go north and then a little west of the Dulles terminal complex to reach the storage yard, why not put several stations along Dulles Greenway to provide access to Ashburn? Ashburn saw a lot of development and growth in the past decade up to 2008, so there is a large population out there, although it is spread out in classic American suburban sprawl. Building proper TOD development around the 2 stations beyond Dulles will be a long term item, not near term. The far flung extension of the Silver Line makes the outer stations more of a 3rd rail electrified commuter line (ala LIRR), not a close in metro system. On weekends and middle of the day, might see service frequencies cut back to 1/2 hour headways.
However, I can see if the cost increases for the Phase II extension become a major problem, that one of the stations, probably the Rt. 606 station, could get dropped and becomes a future in-fill station project to be built later at a future TBD date.