High Quality Content by WIKIPEDIA articles! Sound Transit has been the popular name of Washington state's Central Puget Sound Regional Transit Authority since September 19, 1999. It was formed in 1996 by the Snohomish, King, and Pierce County Councils. It operates express bus, commuter rail, and light rail service in the region and constructs capital projects in support and expansion of those services. Sound Transit's express bus fleet is operated by local transit authorities Community Transit, King County Metro, and Pierce Transit. Its Regional Express Bus Service provides service to cities in all three counties, including Seattle, Redmond, Issaquah, Lakewood, Bellevue, Auburn, Federal Way, Gig Harbor, Everett and Tacoma.