1921

• Pacific Northwest Traction introduces "motor stage" service between Everett and Mount Vernon.
• C.G. Anderson purchases the North End Transportation Line and turns it into the Seattle Motor Coach Company serving Greenwood and Seattle.

1922

• State Supreme Court blocks use of general tax revenue to subsidize Seattle street railways, dooming system to eventual bankruptcy.
• Seattle-Renton Stage Line incorporates and extends service to Bothell in 1923. The company becomes Lakeshore Lines in 1943.

1925

• North Bend Stage Lines acquires the Preston-Issaquah-Seattle Stage Line and the Cascade Mountain Stage Line.

1927

• Pacific Northwest Traction operating as North Coast Lines opens new interurban rail and stage depot (now the Greyhound Terminal) in downtown Seattle.
• Charles Claringbould begins operating buses between Roanoke and Beaux Arts as the Overlake Transit Service.

1928

• Puget Sound Electric Railway, a subsidiary of the local power company, ends interurban rail services between Seattle and Tacoma, and Mount Vernon and Bellingham.
• Last electric interurban railcar leaves Seattle for Tacoma.
• Suburban Transit System created by merging Yost Auto Company, Des Moines Auto Company and Seattle Motor Coach Company. Later that year, Suburban acquires the Haller Lake Transportation Company.

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