Tram systems in Seattle

Seattle’s first streetcar service began on 23 September 1884, using horse-drawn cars on a route along Second Avenue. Cable railways followed, providing a means of climbing the city’s steep hills, and the first electric streetcars entered service in 1889. Privately developed lines expanded rapidly, linking the centre with growing residential districts and helping to shape the development of neighbourhoods beyond the waterfront.

By the early twentieth century, much of the network had been consolidated under companies controlled by Stone & Webster. The city acquired the principal private streetcar system in 1919, bringing it into municipal ownership. However, the purchase debt, ageing infrastructure and increasing competition from motor vehicles placed the undertaking under sustained financial pressure.

Electric interurban railways extended Seattle’s rail connections beyond the city. The Seattle–Tacoma line opened in 1902, serving communities in the valley to the south, while the Seattle–Everett line opened in 1910. These services carried passengers between the region’s principal towns and encouraged development along their routes. A separate railway through the Rainier Valley also linked Seattle with Renton.

Improved roads and growing competition from cars and buses undermined the interurban services. The Tacoma route closed in December 1928, the Rainier Valley line in 1937 and the Everett route in February 1939. Seattle’s municipal streetcar network was subsequently replaced by motor buses and trolleybuses, with the final streetcar service ending in April 1941.

Streetcars returned to Seattle on 29 May 1982 with the opening of the Waterfront Streetcar between Pioneer Square and Pier 70. Championed by city councillor George Benson, the line used historic trams imported from Melbourne and became a distinctive feature of the waterfront. An extension opened in June 1990, taking services through Pioneer Square to Fifth Avenue and Jackson Street in the Chinatown–International District.

The line ceased operation in November 2005 when its maintenance depot was removed to make way for the Olympic Sculpture Park. Although the closure was initially intended to be temporary, proposals for a replacement depot did not result in services being restored. The heritage line therefore remained separate from the modern streetcar revival that followed.

Modern streetcar operation began on 12 December 2007, when the South Lake Union Streetcar opened between the Westlake area and South Lake Union. A second, physically separate route followed on 23 January 2016: the First Hill Streetcar, connecting Pioneer Square and the Chinatown–International District with First Hill and Capitol Hill.

Alongside the streetcar revival, Seattle developed a larger regional light rail network. Voters approved the Sound Move transport programme in 1996, providing the basis for Sound Transit’s initial rail projects. Central Link opened on 18 July 2009 between Westlake in downtown Seattle and Tukwila International Boulevard, with the extension to Seattle–Tacoma International Airport following that December.

Link extended north to the University of Washington and south to Angle Lake in 2016. The Northgate extension followed in 2021, adding stations at U District, Roosevelt and Northgate. In August 2024, the route reached Lynnwood via Shoreline and Mountlake Terrace, extending the network into Snohomish County.

The first section of the 2 Line opened in April 2024 between South Bellevue and Redmond Technology, initially operating separately from the Seattle network. It was extended to Downtown Redmond in 2025. The 1 Line also expanded that year, reaching Federal Way Downtown on 6 December.

On 28 March 2026, the Crosslake Connection joined the 2 Line to Seattle across Lake Washington, adding stations at Mercer Island and Judkins Park and enabling through services between Downtown Redmond and Lynnwood. Pinehurst station opened on the shared northern corridor on 30 September 2026, completing the latest addition to the network.

Seattle currently has 4 tram lines, which are listed below.

Seattle’s Link light rail and modern streetcar lines are separate systems, with different infrastructure and operating characteristics. Both use standard-gauge track, measuring 1,435 mm, but there are no track connections between Link and the streetcars, or between the two streetcar lines.

Link light rail uses double-track routes combining tunnels, elevated structures and surface sections. Much of the network is separated from road traffic, although surface running in the Rainier Valley includes road junctions controlled by traffic signals. Power is supplied through overhead wires at 1,500 V DC, collected by pantographs. Stations accommodate trains of up to four vehicles, with platforms providing level access to the vehicles’ low-floor boarding areas.

A distinctive feature is the 2 Line’s crossing of Lake Washington on the Homer M. Hadley floating bridge. The bridge rests on concrete pontoons and moves in response to changes in loading, wind and waves. The railway is designed to accommodate these movements, while a wind and wave monitoring system allows operating restrictions to be applied when conditions require them.

Seattle Streetcar operates primarily on tracks embedded in city streets, sharing much of its route with other traffic. The overhead supply is 750 V DC. The First Hill line also uses battery operation, allowing trams to run without overhead wires on the journey from Capitol Hill towards Pioneer Square. Batteries recharge through regenerative braking and while drawing power from the overhead supply on the return journey. This arrangement reduces conflicts with the overhead wiring used by Seattle’s trolleybuses.

Streetcar stops have raised boarding platforms, and the vehicles are equipped with deployable bridge plates to provide accessible boarding across the gap between tram and platform.

Link light rail uses two generations of articulated vehicles: the original Kinkisharyo Series 1 cars and the newer Siemens S700 Series 2 cars. Both types have driving cabs at each end and operate in coupled formations, allowing train length to be adjusted to service requirements.

The Kinkisharyo vehicles entered passenger service with the original Seattle Link route in 2009. Each is approximately 29 metres long, with around 70% low-floor space, four passenger doorways on each side and dedicated wheelchair and bicycle areas. The original fleet comprises 62 vehicles.

The Siemens S700 vehicles entered service in 2021. Built in Sacramento, they provide a wider central aisle, larger windows, additional bicycle accommodation and updated passenger information displays. The Seattle version is adapted for Link’s 1,500 V power supply.

Seattle Streetcar uses smaller Inekon articulated trams, approximately 20 metres long, with driving cabs at both ends and low-floor boarding sections. The fleet comprises three Trio 12 vehicles and seven Trio 121 vehicles. South Lake Union has the three Trio 12 cars and one Trio 121, while First Hill has six Trio 121 cars.

The Trio 121 vehicles incorporate the onboard battery equipment required for First Hill’s off-wire operation. Streetcars normally operate individually, providing a smaller-scale service suited to the city streets and closely spaced stops of the two routes.

The West Seattle Link Extension will connect the existing network at SODO with Delridge and Alaska Junction, crossing the Duwamish Waterway on a new light rail bridge. The project is in final design and is funded through construction under Sound Transit’s revised expansion programme. The current design includes a reconstructed SODO station and new stations at Delridge and Alaska Junction; the previously proposed Avalon station has been removed. Service is planned to begin in 2035 as part of the future 3 Line.

A new street-level station is planned on the existing light rail route in the Rainier Valley, between Columbia City and Othello. Located near the junction of Martin Luther King Jr. Way South and South Graham Street, it will improve access for Hillman City and surrounding neighbourhoods. The project is funded through planning, design and construction, with preliminary engineering and environmental review under way.

The Tacoma Dome Link Extension will continue the regional light rail network south from Federal Way Downtown to Tacoma. Approximately 8.5 miles (14 km) of mostly elevated railway will serve four new stations in South Federal Way, Fife, East Tacoma and the Tacoma Dome area. The project is funded through construction and remains in environmental review, with service currently planned to begin in 2035.

To the north, the Everett Link Extension will add approximately 16 miles (26 km) of railway beyond Lynnwood. The funded programme provides for an initial opening to the Southwest Everett Industrial Center in 2037, followed by the continuation to Everett Station in 2041. The extension is currently in environmental review and includes a new maintenance facility to support the expanding regional fleet.

The Ballard Link Extension programme includes a new light rail tunnel through central Seattle, increasing capacity and serving additional city-centre destinations. Under the revised programme, construction of the initial section from SODO to Seattle Center is funded, with opening anticipated in 2042. Environmental review is continuing, and the final route and station arrangements remain subject to further decisions.

Planning and final design are also funded for the continuation from Seattle Center to Ballard. However, construction funding for this section has not yet been secured, so completion of the full route remains dependent on additional resources and cost reductions.

The approved regional programme also includes a future 4 Line between South Kirkland and Issaquah, sharing part of the existing 2 Line route through Bellevue. Funding is included for planning, design and construction, with early planning work scheduled to begin in 2027. The current opening forecast is 2050, making this a longer-term expansion of the connected network east of Lake Washington.