Seattle Department of Transportation planning manager Tony Mazzella and Tom Brennan of Nelson/Nygaard presented the recommendations to the Seattle City Council's transportation committee this morning (.pdf). The routes are among 15 high-priority corridors previously singled out by the Seattle Department of Transportation and transportation consulting group Nelson/Nygaard for light rail and rapid bus service investments in the city's ongoing Transit Master Plan update. Once completed, the plan will provide the city with a 20-year template for future transit investments.
So why were these north-and-city-centric corridors selected for street rail above others—like, say, a high-capacity service to West Seattle?
Mazzella says that the routes were chosen using a variety of quantitative and qualitative factors—including social equity, current and future transit demand, alignment with Sound Transit routes, neighborhood zoning, and topography (you'll notice that on the above map a fourth high-priority route stretching from Coleman dock up Madison Street was earmarked for Bus Rapid Transit—which is essentially a bus route with fewer stops—due to its steep grade).
And when 12,000 people were surveyed about Seattle's transit system last fall, "people said speed and reliability were their highest needs," explained Brennan. "We didn’t hear a lot about transit coverage."
Plus, "we felt [street rail] was heavily weighed towards serving commuters," explained Mazzella. "And serving the areas of greatest growth means serving urban centers." Nevertheless, council members seemed cautious of the plan, if not downright skeptical of investing in street rail over buses.
"We're on the verge of building the Capitol Hill street car and there are suggestions that we should've done it differently or should be doing it differently," says council member Tim Burgess, who didn't elaborate on what the hell he was talking about.
"Are the investments we're making in South Lake Union and the First Hill street car ones that are good long term investments?" echoed committee chair Tom Rasmussen. "Are we making mistakes now that we'll regret later?"
I'm not sure what the fuck, exactly, they're getting at.
But here's a quick stab in the dark: Obviously, street rail is the most expensive option to build along these corridors—SDOT estimates that street rail would cost $47 million per mile to extend a rail line to Ballard, as opposed to $16 million per mile for BRT—and these capital costs would be shouldered by the city, not King County Metro. And the city is currently broker than a Greece.
But there are three points to consider, here:
1) The Transit Master Plan is a 20-year plan (and beyond). It would be foolish not to plan for street rail, which Brennan estimates is a seven-year planning-to-construction process. And the plan doesn't prioritize street rail above other, cheaper transit improvement projects—like bus rapid transit, or smaller investments in bus bulbs, boarding islands, off-board fare payment, or raised bus boarding platforms.
2) While capital costs are higher for building street rail, operating costs will likely be higher for operating multiple buses (paying for more drivers, maintenance on more buses) to accommodate the city's growing demand. The city could apply for federal assistance to help cover its capital costs (but not operating costs).

It seems like we'll have months yet to argue about this. SDOT is planning on submitting its final version of the Transit Master Plan to Mayor Mike McGinn in September. After that, the plan will likely go through several rounds of public comment before being submitted to the council for consideration early next year.
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@3, bus rapid transit is basically the same bus routes we have now with fewer stops. It's one of the options being considered.
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Throw down a platform @ Golden Gardens. Plenty of parking there and call it a day.
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