The first elevated train in Chicago was opened in 1888. The separate lines were unified in 1911-13. The rumble of the "L" train overhead is part of the Chicago experience for sure!
Chicago's elevated trains are part of its history and its present. The "Loop" gets it's name from the elevated platforms that "loop" around the center of the business district.
RATTLE-RATTLE-RATTLE-RATTLE-RATTLE-THURUM-THRUM-THRUM-EEK-EEK-EEK-change for the brown line-doors open on the right
The Elevated railway, know as the El or L, is unique to Chicago, with a network covering most of the city and an unique view from the trains.
Just a little tip, on the El do not forget to take your ticket from the machine at the entrance! Public transport is run by CTA
It's called the 'El' because it is actually elevated and not only provides reliable transportation, but it also is a great way to see the city.