Template:The Loop 1955–1958

This map depicts operating conditions from 1955 to 1958. Due to the construction of the double-level Wacker Drive, the Tower 8 junction (Wells and Van Buren) was closed in 1955 and was replaced with a temporary junction (Tower 22) built through the Wells Street Terminal. The new trackage joined the Loop just south of Quincy.

The Ravenswood and Evanston Express made a complete circuit on the Outer Loop track. Lake Street, Douglas, and Garfield services also made a complete circuit but operated on the Inner Loop track. Due to the construction of the Congress Street Superhighway, Douglas trains were routed onto Lake Street and entered the Loop at Tower 18, similar to today's Pink Line. Garfield Park trains entered the Loop through the temporary junction built through the shuttered Wells Street Terminal. The North Shore Line, which ran through the Loop, operated on the Outer Loop track with southbound trains using Wells and Van Buren and northbound trains using Wabash and Lake.