North Side main line
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The North Side Main Line is a branch of the Chicago "L" system that is used by Red, Purple, and Brown Line trains. As of 2012, it is the network's busiest rail branch, serving an average of 123,229 passengers each weekday. The branch is 10.3 miles (16.6 km) long with a total of 21 stations, from Howard Street in Rogers Park down to Lake Street in Chicago's Loop. The branch serves the north side of the city 24 hours a day, seven days a week.
Brown and Purple Line Express trains run above Franklin Street
The North Side Main Line runs on the old Northwestern Elevated Railroad
The Belmont station under construction in 2007
A temporarily rerouted Red Line train leaves the North Side Main Line and enters the Loop
The Loop (CTA)
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The Loop is the 1.79-mile-long (2.88 km) circuit of elevated rail that forms the hub of the Chicago "L" system in the United States. As of 2022, the branch served 31,893 passengers every weekday. The Loop is so named because the elevated tracks loop around a rectangle formed by Lake Street, Wabash Avenue (east), Van Buren Street (south), and Wells Street (west). The railway loop has given its name to Chicago's downtown, which is also known as the Loop.
A Brown Line train passes through Tower 12 as it makes the turn from Van Buren onto Wabash, while an Orange Line train waits for it to clear
A Brown Line train departing from Madison/Wabash
Northward view from the Adams/Wabash station at night