The Seattle Center Monorail is an elevated monorail line in Seattle, that runs a little under one mile along Fifth Avenue between Seattle Center in Lower Queen Anne and Westlake Center in Downtown. Seattle Center Monorail is a fully self-sufficient public transit system with a top speed of 45 mph (72 km/h). Owned by the City of Seattle, the line has been operated by a private contractor, Seattle Monorail Services, since 1994. The monorail trains and their tracks were given historical landmark status by the Seattle Landmarks Preservation Board April 16, 2003. From: http://en.wikipedia.org/wiki/Seattle_Center_Monorail

The monorail, which cost $3.5 million to build, opened on March 24, 1962 for the Century 21 Exposition, a World´s Fair 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 million. The line and its trains were built by Alweg Rapid Transit Systems. From: http://en.wikipedia.org/wiki/Seattle_Center_Monorail