SkyTrain is the rapid transit metropolitan rail system of Greater Vancouver, British Columbia, Canada. SkyTrain has of track and uses fully automated trains on grade-separated tracks running on underground and elevated guideways, allowing SkyTrain to hold consistently high on-time reliability. The name, SkyTrain, was coined for the system during Expo 86 because the first line (Expo) principally runs on elevated guideway outside of Downtown Vancouver, treating passengers to panoramic views of the metropolitan area. SkyTrain has the world's longest cable-supported transit-only bridge, known as SkyBridge, to cross the Fraser River in the suburbs.