Thursday, December 9, 2021

December newsletter, and change to calendar back end

In case you've missed it, the December newsletter has gone out:

As always, you can access these from the Newsletter archive (tab above).

The next speaker's topic is sure to be interesting, with the December 13 Future Fuel technical event, as mentioned in a previous post.  Be sure not to miss it!

Also, please note the calendar has had to change recently, so if you had subscribed to our past calendar and it is no longer working, please go over to the Events Calendar tab and subscribe to the new one.  We had to make a change for a back end platform tweak.

Monday, December 6, 2021

SAE NW Technical event: Engineering Challenges of Placing Light Rail across a Floating Bridge


SAE NW Technical event: Engineering Challenges of Placing Light Rail across a Floating Bridge with John Sleavin, Deputy Executive Director of Design Engineering and Construction Management at Sound Transit is on Dec 7 at 5PM PST.

Running light rail over a floating bridge has never been done before anywhere in the world. Sound Transit will be the first agency to ever do this. Installing light rail across the flexing, twisting I‑90 Lake Washington Floating Bridge presented a host of unique engineering challenges including weight limitations, ensuring electric-powered trains could travel safely across a large body of water, and more. We’ll cover a few of them and go into detail on how they placed light rail tracks from the fixed bridge to the floating bridge across eight transition joints, each of which had to accommodate six degrees of movement. We’ll trace the engineering challenges from early concept, through design, testing, and installation. John Sleavin’s engineering career includes an impressive array of transportation projects, including several in Malaysia, Singapore, and Portland. In Seattle, the projects he’s been involved with are almost the history of major engineering projects within the region. They include Link Light Rail in Tacoma, the South Lake Union Streetcar, Sounder Commuter Rail between Seattle and Tacoma, the original Downtown Seattle Transit Tunnel, construction of the light rail segment from downtown to the airport including Beacon Hill tunnels, the University and Northgate Link Extensions, and the 14-mile East Link Extension which includes the I‑90 Floating Bridge. Currently John oversees Link Extensions to the Tacoma Dome, West Seattle, Ballard, and Everett, and Operations and Maintenance Facilities North and South.