and carry cycle racks; they can carry two wheelchairs and bicycles. Vancouver is actively maintaining and upgrading its trolleybus fleet. With purchases of 188 E40LFRs and 74 E60LFRs from New Flyer Industries (in 2005–2009), the trolley network serves the downtown core and much of the city of Vancouver proper with fully wheelchair-accessible and bicycle-friendly zero-emission buses. Certain diesel commuter buses which travel to the suburbs as RapidBus have bicycle racks, wheelchair lifts, reading lights and high back reclining seats. Frequency in Greater Vancouver ranges from every couple of minutes within downtown Vancouver to two to three trips a day in far-flung suburbs such as Maple Ridge, Langley, and Aldergrove. SkyTrain The SkyTrain is an advanced rapid metro system operating fully automated trains on three lines. Built for the Expo 86 World's Fair, it has since become the world's second longest automated light rapid transit system utilizing the world's longest transit-only bridge, the SkyBridge. The Expo Line and Millennium Line link downtown to the suburbs of Burnaby, New Westminster, Surrey, and Coquitlam. A third rapid transit line connecting downtown Vancouver to central Richmond and the Vancouver International Airport, known as the Canada Line, started operation on August 17, 2009. It utilizes Hyundai Rotem instead of the linear induction Bombardier technology used on the first two lines. Future expansion Plans from the 2000s to expand the Expo Line to the southeast, increasing its capacity and extending its route further into the city of Surrey, were superseded in the mid-2010s by a proposed light rail line. These plans were themselves superseded in 2018 in favour of a return to the planned SkyTrain extension. , construction is underway for a $2-billion extension of the Millennium Line west towards Kitsilano and Point Grey. The phase 1 extension would start at the current VCC–Clark SkyTrain station terminus, then run under the Broadway corridor to terminate at a station at Arbutus Street; it is expected to be completed in 2025. At a future date, a phase 2 extension would be built to the University of British Columbia. In 2022, funding for a extension of the Expo Line southeast through Surrey into Langley was formally approved by the provincial and federal governments. Major construction is expected to proceed from 2024 until the line opens in 2028. In early 2022, TransLink and the Mayors' Council approved the 10-year priority projects of the Transport 2050 plan through to the early