Horrible news, and it hits close to home.
I've taken that train between Portland and Seattle many, many times. The Amtrak
Cascades is a joint venture between Amtrak and the states of Washington and Oregon, to provide frequent passenger service between Seattle and Portland, with two trains a day continuing north to Vancouver BC and south to Eugene, Oregon.
Cascades is a tenant using the freight lines of the BNSF Railway (and UP, which has trackage rights on BNSF) north of Portland Union Station, and of Union Pacific south of that point. The locomotives and rolling stock are owned by the states, and crews are Amtrak employees. The passenger cars are low-slung, lightweight, semi-permanently-coupled types originally built by the Talgo company of Spain, though a couple of the newer trainsets were built in the US under license. The suspension connects to the tops of the cars like a pendulum, allowing the cars to lean into turns at higher speed. They're actually quite comfortable and ride well. They do look odd with that low profile, though.
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Until last week, anyway, the most scenic part of the route was between Olympia and Tacoma, as the train cruised slowly along the shore of Puget Sound, through the quaint fishing and resort towns, past the gorgeous Chambers Bay Golf Course (2015 US Open venue), under the Tacoma Narrows Bridge ("Galloping Gertie"), then through a couple of tunnels at Point Defiance before entering Tacoma. The problem was that those tunnels only accommodated single tracks, and the frequent
Cascades schedule, along with the daily Amtrak
Coast Starlight from L.A., interfered with freight traffic. So it was decided to get the passenger trains off the Point Defiance route by rebuilding and adapting an old, little-used freight line south of Tacoma, and connecting with the existing local commuter train line with new bridges and tracks just south of Old Town Tacoma. Bad news was the loss of the scenery along Puget Sound; good news was supposed to have been a slightly shorter route on the new Point Defiance Bypass with higher track speeds and a saving of about ten minutes off the schedule. And BNSF (and its tenant UP) were delighted to get rid of the passenger trains on the Puget Sound route.
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The accident train was the inaugural southbound run from Seattle over the Point Defiance Bypass route. The accident happened on an S-curve over an old bridge over I-5, just north of where the new Bypass Route joins the original route -- just above the letter 'S' of the "Southern Limit Nisqually Junction" label at the bottom of the map above.
I heard a report today that the train was going 81.1 mph.
If that is true, it's not surprising that the train left the track on that curve.
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