(at 36 Street NE and 39 Avenue NE) to the downtown core, with a new downtown terminal station for both lines at 10 Street SW, which opened on April 27, 1985. The Northwest Line, the extension of the South Line to the city's northwest, was opened on September 17, 1987, in time for the 1988 Winter Olympics. This line ran from the downtown core to University station, next to the University of Calgary campus. Since then, all three lines have been extended incrementally, with most of the stations commissioned and built in the 2000s (with the exception of Brentwood which opened in 1990, three years after the original Northwest line opened). The West Line, the extension of the Northeast Line, opened for revenue service on December 10, 2012 as the first new line to open in 25 years. The line runs for 8.2 km from Downtown West–Kerby station on 7 Avenue at 11 Street SW at the west end of Downtown, westward to 69 Street station located at the intersection of 17 Avenue and 69 Street SW. Operations Lines The CTrain system has two routes, designated as the and the . They have a combined route length of . Much of the South leg of the system shares the right of way of the Canadian Pacific Railway and there is a connection from the light rail track to the CPR line via a track switch near Heritage station. The longer route (Red Line; serves the southern and northwestern areas of the city. The shorter route (Blue Line; long) serves the northeastern and western sections of the city. Most track is at grade, with its own right-of-way. The downtown portion is a shared right-of-way, serving both routes along the 7th Avenue South transit mall at street level. This portion is a zero-fare zone and serves as a downtown people mover. The tracks split at the east and west ends of downtown into lines leading to the south, northeast, west and northwest residential neighbourhoods of Calgary. Six percent of the system is underground, and seven percent is elevated. Trains are powered by overhead electric wires, using pantographs to draw power.In the first quarter of 2015, the CTrain system had an average of 333,800 unlinked passenger trips per weekday, making it the busiest light rail system in North America. Ridership has declined slightly since reaching this peak, coinciding with a recession in the