Sound Transit (ST), officially the Central Puget Sound Regional Transit Authority, is a public transit agency serving the Seattle metropolitan area in the U.S. state of Washington. It operates the Link light rail system in Seattle and Tacoma, regional Sounder commuter rail, and Sound Transit Express bus service. The agency also coordinates the regional ORCA fare card system, which is also used by local transit operators. In 2017, Sound Transit services carried a total of 47 million passengers and averaged 157,000 riders on weekdays. Sound Transit was created in 1993 by King, Pierce and Snohomish counties to build a regional rapid transit system. After an unsuccessful proposal in 1995, the agency's plan for regional light rail, commuter rail, and express bus service, named "Sound Move", was approved in November 1996. ST began operating its express bus service in September 1999, taking over existing routes from local transit agencies. The region's first commuter rail line, between Tacoma and Seattle, started in December 2000; the agency's first light rail line, Tacoma Link (now the T Line), began service in August 2003. Light rail service in Seattle on Central Link (now the 1 Line) began in 2009, and is the largest part of the Sound Transit system in terms of ridership. Union Station in Seattle has served as the agency's headquarters since its renovation in 1999. Sound Transit is independent of local transit agencies and is governed by an eighteen-member Board of Directors made up of elected officials from member jurisdictions and the Secretary of Transportation. It is funded by local sales taxes, property taxes, and motor vehicle excise taxes, levied within its taxing district in portions of King, Pierce and Snohomish counties. The agency has passed three major ballot measures to fund system expansion: Sound Move (1996), Sound Transit 2 (2008) and Sound Transit 3 (2016). Planning and construction of new light rail lines is scheduled to continue until 2041 under the Sound Transit 3 plan, which would expand the network to and 70 stations. Services Sound Transit operates three transit services across the Seattle metropolitan area: the Link light rail system in Seattle and Tacoma; the Sounder commuter rail system from Everett to Lakewood, via Seattle; and the Sound Transit Express bus system across the three counties. In 2017, these systems carried more than 47 million passengers, averaging 156,000 riders on weekdays. All three modes accept cash payment and mobile tickets