Train tracks that float

EAST LINK BRIDGE SOUND TRAN­SIT

Popular Science - - BEST OF WHAT’S NEW 2017 -

Rails need to stay straight, but float­ing bridges bob and sway with the wa­ter be­neath. Not a good match? Not a prob­lem for Sound Tran­sit’s new project. On this bridge—which will be com­pleted in 2023— steel plat­forms and flex­i­ble bear­ings will let light-rail tracks stay in line. By 2030, 50,000 com­muters a day will ride 148,000pound trains at full speed across the wa­ter from Seat­tle to Mercer Is­land, Wash­ing­ton.

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