Seattle Monorail. The Seattle Center Monorail is an elevated monorail line in Seattle, Washington, that runs a little over one mile along Fifth Avenue from Westlake Center in Downtown to Seattle Center in Lower Queen Anne. It claims to be the "only fully self-sufficient public transit system" in the United States, and with a top speed of 50 mph (80 km/h), to also be the fastest full-sized monorail in the country. The monorail trains and their tracks were given historical landmark status by the Seattle Landmarks Preservation Board April 16, 2003.

The monorail, which cost $3.5 million to build, opened on March 24, 1962 for the Century 21 Exposition, a World's Fair being held at the current site of Seattle Center. Eight million people rode the monorail during the half year the fair was open; today, annual ridership is around 2.5 million.