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Minimum railway curve radius
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The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions. It has an important bearing on construction costs and operating costs and, in combination with superelevation in the case of train tracks, determines the maximum safe speed of a curve. The minimum radius of a curve is one parameter in the design of railway vehicles as well as trams; monorails and automated guideways are also subject to a minimum radius.
90-foot (27.43 m) radii on the elevated 4 ft 8+1⁄2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii above this street inter
90-foot (27.43 m) radii on the elevated 4 ft 8+1⁄2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii above this street intersection at this cross junction at the Wells and Lake street intersection in the northwest corner of 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 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
A Brown Line train departing from Madison/Wabash
Northward view from the Adams/Wabash station at night
Northward view from the Adams/Wabash station at night