<P> The first streetcars appeared in 1889 and were instrumental in the creation of a relatively well - defined downtown and strong neighborhoods at the end of their lines . The advent of the automobile sounded the death knell for rail in Seattle . Tacoma--Seattle railway service ended in 1929 and the Everett--Seattle service came to an end in 1939, replaced by inexpensive automobiles running on the recently developed highway system . Rails on city streets were paved over or removed, and the opening of the Seattle trolleybus system brought the end of streetcars in Seattle in 1941 . This left an extensive network of privately owned buses (later public) as the only mass transit within the city and throughout the region . </P> <P> King County Metro provides frequent stop bus service within the city and surrounding county, as well as the South Lake Union Streetcar line and the First Hill Streetcar line . Seattle is one of the few cities in North America whose bus fleet includes electric trolleybuses . Sound Transit currently provides an express bus service within the metropolitan area, two Sounder commuter rail lines between the suburbs and downtown, and its Central Link light rail line between the University of Washington and Angle Lake . Washington State Ferries, which manages the largest network of ferries in the United States and third largest in the world, connects Seattle to Bainbridge and Vashon Islands in Puget Sound and to Bremerton and Southworth on the Kitsap Peninsula . </P> <P> According to the 2007 American Community Survey, 18.6% of Seattle residents used one of the three public transit systems that serve the city, giving it the highest transit ridership of all major cities without heavy or light rail prior to the completion of Sound Transit's Central Link line . The city has also been described by Bert Sperling as the fourth most walkable U.S. city and by Walk Score as the sixth most walkable of the fifty largest U.S. cities . </P> <P> Seattle--Tacoma International Airport, locally known as Sea - Tac Airport and located just south in the neighboring city of SeaTac, is operated by the Port of Seattle and provides commercial air service to destinations throughout the world . Closer to downtown, Boeing Field is used for general aviation, cargo flights, and testing / delivery of Boeing airliners . </P>

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