The
Green Line is a
rapid transit line on the
Chicago Transit Authority's
"L" system. It is the only completely elevated route in the entire system. It utilizes the system's oldest segments (dating back to 1892), extending with 30 stops between
Forest Park and
Oak Park (Harlem/Lake), through
Chicago's West Side to the
Loop, and then to the
South Side and
Englewood (Ashland/63rd) and
Woodlawn (Cottage Grove/63rd). As of September 2012, the average number weekday boardings on the Green Line is 70,554. The Green Line operates between Harlem/Lake and Cottage Grove, weekdays from 4:00 a.m. to 1:00 a.m., and Saturdays and Sundays from 5:00 a.m. to 1:00 a.m., and between Harlem/Lake and Ashland/63rd, weekdays from 3:50 a.m. to 1:05 a.m., and Saturdays and Sundays from 4:50 a.m. to 1:05 a.m.