At South Wye Junction (MP 1.2), there was once a wye between the line coming south from (Illinois) Central Station and the still-extant St. Charles Air Line coming from the west. Today's line turns south-southeast, along the west side of Metra's 18th Street Yard for the electric commuter trains, bridging over the Metra Electric line (formerly the IC suburban electric line) to attain its east side. The speed limit on the now double track line is 10 mph north of MP 3.0, 60-40 between MP 3.0 and 4.0, and 65-50 south of MP 4.0. There was once an IC yard on the east side of the line at 27th Street, and still is an interchange yard on the east side of the line south of 31st Street. Between 47th Street and 51st Street, the lines turn south-southwest, and at 63rd Street, the CTA Elevated line to Jackson Park once bridged overhead (and today is truncated at University).
There are crossovers at 67th Street (MP 8.1), and the main line bridges over the Metra Electric branch east to South Chicago. The ex-NYC alignment and ex-PRR tracks bridge overhead at 75th Street, the IC Fordham Yard is on the east side of the line between 75th Street and 91st Street, and the Belt Railway of Chicago and former C&WI bridge overhead, with connectors in the northeast and southeast quadrants, between 91st Street and 95th Street.