downtown Blue South (Delridge): Westwood/Highland Park to Delridge (Green Line station) Red: east–west, connecting South Park and the Rainier Valley (outside Seattle city limits; preliminary work only) Rainbow: north–south, connecting downtown to the University District, with two potential extensions continuing on toward the north: Extension 1: U-District to Northgate Extension 2: U-District to Lake City See also Seattle Streetcar – a project whose first line was built during the time when the monorail would have been built Link light rail – a light rapid transit project executed by Sound Transit in the Seattle area. The first line in Seattle, Central Link, began service in 2009, with expansion to the University of Washington completed in 2016. References External links Website commemorating the defunct Seattle monorail project. Transportation in Seattle Cancelled monorails Proposed transportation infrastructure in the United States Cancelled projects in the United States