The Purple Line of the Chicago "L" is a 3.9-mile route on the northernmost section of the system. The service normally begins from Linden in Wilmette and ends at Howard on Chicago's north border, passing through the city of Evanston.
During weekday rush hours, the Purple Line extends another 10.3 miles south on the North Side Main Line from Howard to downtown Chicago running express from Howard to Belmont, with a single stop at Wilson, and then making all local stops from Belmont to the Loop.
It is the shortest route in the CTA rail system except during weekday peaks and rush hours.
Prior to the color-coding of CTA rail lines in 1993, the Purple Line was known as the Evanston Line, Evanston Service or Evanston Shuttle, and the Purple Line Express was called the Evanston Express.
Adapted from https://en.wikipedia.org/wiki/Purple_Line_(CTA)
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