eight island platforms, each island platform servicing two tracks. Not all the platforms are the same length; the platforms on the western part of the station (tracks 1–10) are significantly longer than the eastern platforms. In general, West Line trains depart from the western platforms (roughly tracks 1–5), Northwest Line trains depart from the middle tracks (6–11), and North Line trains depart from the eastern tracks (12–16). This is done so that departing and arriving trains do not have to make large switch movements, which would block the use of other tracks and prevent multiple trains from arriving and departing at the same time. Just north of the station, the number of tracks reduces from 16 to six. Switches allow for trains on any of the 16 station tracks to end up on any of these six tracks, and vice versa. About a third of a mile from the station, the six tracks split into two mainlines of four tracks. One mainline turns west, while the other turns northwest. West Line trains take the west tracks, while Northwest and North Line trains take the northwest tracks. Services The Chicago and North Western Terminal has served as a terminal for all the commuter and intercity trains of the Chicago and North Western Railway. In addition, on November 9, 1969, the day after Grand Central Station closed, the Baltimore and Ohio Railroad and Pere Marquette Railway, Grand Central's two remaining users, moved their remaining intercity services into the C&NW's terminal. Those trains, which used the C&NW's branch to the St. Charles Air Line west of Western Avenue, last ran on April 30, 1971, the day before Amtrak took over most intercity passenger trains in the U.S. Amtrak services over the lines of those two railroads have run into Union Station. Metra's three Union Pacific District lines – the Union Pacific/North Line, Union Pacific/Northwest Line and Union Pacific/West Line – now provide regular commuter rail service along three former C&NW lines. In Metra's zone-based fare schedule, Ogilvie is in Zone A. More than 106,000 people board Metra trains at Ogilvie Transportation Center each day. Traffic statistics Bus and 'L' connections Bus connections can be made on Madison Street or Washington Boulevard via the Citigroup Center or through a lower level concourse accessible by the track platforms between Washington Boulevard and Randolph Street with entrances at Canal and Clinton Streets. Connections can also be