Sound Transit

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The Central Puget Sound Regional Transit Authority, branded as Sound Transit (ST), is a public transit agency serving the Seattle metropolitan area in the U.S. state of Washington. It manages the Link light rail system in Seattle and Tacoma, regional Sounder commuter rail, and Sound Transit Express bus service. The agency also coordinates with the regional ORCA fare card system used by transit operators across the metropolitan area. In 2025, Sound Transit services carried approximately 51 million total passengers and averaged over 153,000 riders on weekdays. The agency was created in 1993 by King, Pierce and Snohomish counties to build a regional rapid transit system. After an unsuccessful proposal in 1995, the "Sound Move" plan for regional light rail, commuter rail, and express bus service was approved by voters in November 1996. Sound Transit began operating its express bus service in September 1999, taking over existing routes from local transit agencies. The region's first commuter...

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