Seattle, Washington: Sound Transit

General discussion of passenger rail proposals and systems not otherwise covered in the specific forums in this category, including high speed rail.

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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Sat Apr 01, 2017 2:44 am

Northgate Link Extension | Sound Transit -- construction continues. Its construction cams show the extension's three stations: U District, Roosevelt, and Northgate, along with the Maple Leaf tunnel portal a little south of Northgate. U district and Roosevelt are being built in cut-and-cover fashion, with their walls and floors now being in place, though not much more. The Northgate station, however, will be elevated.

Lynnwood Link Extension | Sound Transit north of Northgate -- still in planning. It will closely follow I-5, and it will alternate between surface and elevated trackage.

Downtown Redmond Link Extension | Sound Transit east of Bellevue and Federal Way Link Extension | Sound Transit south of Sea-Tac are still in planning. The latter will alternate between surface and elevated along I-5.


Seattle Streetcar: Center City They've selected a route for it:
First Hill streetcar line - S. Jackson St. - 1st Ave. near the waterfront - Stewart St. - South Lake Union line

Seattle Streetcar: First Hill Streetcar: Broadway Extension north of First Hill for two stations. "Design of the project is currently on hold. (12/12/16)"


ETA: The end is near for Bertha: After nearly 2 miles in 4 years, tunnel machine about to break through | The Seattle Times Seattle's other big tunneling project is about to be completed.
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Re: Seattle, Washington: Sound Transit

Postby mtuandrew » Sat Apr 01, 2017 12:24 pm

Pontoon railroad bridges have been built before, in particular by the Milwaukee Road on the Mississippi. Nothing quite on this scale though, and I can't seem to find a combination road/rail pontoon bridge in the historical record.
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Tue Apr 04, 2017 2:18 am

Project update: East Link Extension, I-90 | Sound Transit
Crossing Lake Washington | Sound Transit
They had to build and test special track bridges for between the fixed and the floating parts of the I-90 bridge.

Lake Washington Floating Bridge - Wikipedia lists three bridges.

The first of them is the Lacey V. Murrow Memorial Bridge - Wikipedia, opened in 1940. It now carries the eastbound lanes of I-90.

The second of them, to the north of the first one, is the Homer M. Hadley Memorial Bridge - Wikipedia, opened in 1989. It carries the westbound lanes of I-90, and it has two reversible High-Occupancy-Vehicle lanes to the south of the main lanes. Those HOV lanes are where the light-rail tracks will be going.


There is a third one over Lake Washington, for state route 520. It's the world's longest and widest floating bridge.
Evergreen Point Floating Bridge - Wikipedia, opened in 1963.
Evergreen Point Floating Bridge (2016) - Wikipedia


About that other tunneling project, Alaskan Way Viaduct - Follow Bertha -- it's to break through on Tuesday, April 4.
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Thu Apr 06, 2017 3:19 am

Project update: Northgate Link Extension, March 2017 | Sound Transit -- shows support columns going up for the Northgate station.

I notice that the north and east extensions have very little street-level trackage, unlike the original line, with a long stretch in MLK Way.

In other tunneling news, Bertha broke through the end on April 4:
Daylight for TBM Bertha at ‏end of epic journey
Alaskan Way Vaduct - Follow Bertha
Alaskan Way Viaduct replacement tunnel - Wikipedia
Bertha (tunnel boring machine) - Wikipedia
Bertha's diameter: 57 ft / 17.4 m, weight: 6700 tons / 6100 mt


Digging for San Jose BART begins in two years - Silicon Valley Business Journal mentions a proposal for using a TBM almost as big as Bertha: a 45-ft tunnel where two tracks would run. The article's illustration shows two stacked tracks, though they might also be side-by-side.

However, they may use smaller TBM's and excavate twin single-track tunnels, as has been done for Seattle light rail.
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Mon Dec 11, 2017 4:44 am

The Sound Transit site now has this: Sound Transit Expansion Map with several lines and details of them.
  • U Washington - Northgate: under construction, will open 2021
  • Northgate - Lynnwood: construction starts 2018, will open 2024
  • Lynnwood - Everett: project launch 2020, will open 2036
  • Downtown - West Seattle (Alaska Junction): in planning, will open 2030
  • Downtown - (new tunnel) - Ballard, will open 2035
  • Downtown - Redmond (East Link): under construction, will open 2023
  • South Kirkland - Issaquah: project launch 2027, will open 2041
  • Angle Lake - Federal Way: in planning, will open 2024
  • Federal Way - Tacoma Dome: project launch 2017, will open 2030
  • Tacoma Link: Theater District - MLK and S 19th: construction starts 2018, will open 2022
  • Tacoma Link: MLK and S 19th - Tacoma Community College: project launch 2026, will open 2039
  • Sounder: Lakewood - DuPont: project launch 2025, will open 2036
So it's
  • Under construction: Northgate (2021), Redmond (2023)
  • Construction starting in 2018: Lynnwood (2024), Tacoma Link extension (2022)
  • In planning: Federal Way (2024)
The other projects may be moved up if some politician wangles Federal or state funding for them.

Center City Connector | Seattle Streetcar -- it will connect Seattle's two streetcar lines, First Hill and South Lake Union. Its route is:

(First Hill) - S Jackson St. - 1st Ave. Stewart St. - Westlake Ave. - (South Lake Union)

It is about 2 blocks west of the light-rail tunnel. Construction has started on utilities in its route, and construction should extend to the system's tracks next year and 2019. So it should open 2020.
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Mon Dec 11, 2017 5:15 am

I noticed that the Home | Seattle Center Monorail | Seattle Monorail line is missing from both the Sound Transit and the Seattle Streetcar maps. It runs between Westlake and the Seattle Center, and since both the SLU streetcar and the light-rail system have stations at Westlake, I expected it to have some mention.
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Re: Seattle, Washington: Sound Transit

Postby Rockingham Racer » Mon Dec 11, 2017 6:50 am

Thanks for that list. Hard to believe it's going to take ELEVEN years to extend commuter rail a few miles to the south.
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Re: Seattle, Washington: Sound Transit

Postby electricron » Mon Dec 11, 2017 10:26 am

lpetrich wrote:I noticed that the Home | Seattle Center Monorail | Seattle Monorail line is missing from both the Sound Transit and the Seattle Streetcar maps. It runs between Westlake and the Seattle Center, and since both the SLU streetcar and the light-rail system have stations at Westlake, I expected it to have some mention.

The monorail isn't apart of the Sound Transit system, that's why it isn't present on the maps. You have to buy a separate ticket to ride it.
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Re: Seattle, Washington: Sound Transit

Postby Arlington » Mon Dec 11, 2017 7:13 pm

Rockingham Racer wrote:Thanks for that list. Hard to believe it's going to take ELEVEN years to extend commuter rail a few miles to the south.

Wouldn't that be more a reflection of where it is on the priority list (and when construction starts) not that they'll be working on it for all 11 years?
"Trying to solve congestion by making roadways wider is like trying to solve obesity by buying bigger pants."--Charles Marohn
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Mon Dec 11, 2017 9:32 pm

Rockingham Racer wrote:Thanks for that list. Hard to believe it's going to take ELEVEN years to extend commuter rail a few miles to the south.

I suspect that it's an issue of priorities.

The planned opening dates: 2021, 2022, 2024 (2), 2030 (2), 2035, 2036 (2), 2039, 2041

The dates have an early cluster, around 2022 - 2023, and a late cluster, around 2036. The later dates have more spread than the earlier ones. I think that those ones are rather pessimistic ones, ones that reflect what funds can be raised locally.
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Re: Seattle, Washington: Sound Transit

Postby lpetrich » Mon Dec 11, 2017 9:34 pm

Arlington wrote:
Rockingham Racer wrote:Thanks for that list. Hard to believe it's going to take ELEVEN years to extend commuter rail a few miles to the south.

Wouldn't that be more a reflection of where it is on the priority list (and when construction starts) not that they'll be working on it for all 11 years?

That's what it seems like to me. But if they get funding for it, they'll likely bump it up.
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