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1911: Engineer Virgil Bogue proposes elevated trains, mixed with subways, in an expensive transit plan that voters reject.

1962: A 1.2-mile monorail from Seattle Center to downtown opens March 24, just before the World’s Fair. Officials consider extensions to Shoreline or Seattle-Tacoma International Airport.

1988: A station is built into the new Westlake Center Mall, allowing the Seattle Center Monorail to survive downtown redevelopment.

1997: Seattle voters approve a grass-roots, citywide monorail initiative, based on the X-shaped system map drawn by tour driver Dick Falkenbury.

2002: By 877 votes, city residents enact a tax on used cars of $140 per $10,000 vehicle value, to finance the 14-mile Green Line through Ballard, Seattle Center, downtown and West Seattle. The next year, revenue turns out one-third short of estimates.

2004: An old monorail train catches fire on Memorial Day, forcing passengers to evacuate on firetruck ladders. The two trains are refurbished.

2005: Seattle Monorail Project leaders Joel Horn and Tom Weeks resign July 4 amid outrage over a 50-year finance plan whose payments would total $11 billion for a $2.1 billion megaproject. The SMP board sends a shorter corridor to the ballot and voters reject it. Government officials promise to work on other transit ideas.

2006: Taxpayer losses total $124 million by the time SMP sells unused station properties and dissolves.

2012: King County Metro Transit launches its RapidRide C and D bus routes, which mostly follow the Green Line corridor.

2014: A new monorail planning measure qualifies for the fall ballot, proposing a $5 car-tab fee, to study a Ballard to West Seattle line passing the downtown waterfront.

— Mike Lindblom, Seattle Times transportation reporter