A three-car Lake Street ‘L’ train crosses the South Branch of the Chicago River at Lake St., just west of the Loop, in April of 1924. The bridge was less than 10 years old at the time–built in 1916, this bi-level street and ‘L’ bridge replaced an older, bi-level swing bridge. Today, the bridge is used by Green Line (Lake Street) and Pink Line (Cermak Branch) trains. (Photo and caption text from the Chicago Transit Authority’s instagram feed.)

Evelyn Hofer, L train station, New York, 1964.

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Under the El at the Battery, 1936