I never realized that C&NW came all the way east to the river down here. They were the main railroad north of the Main Stem of the Chicago River. Wisconsin Central became the B&OCT, and it provided access to the Grand Central Station for WC and Chicago Great Western. The Chicago & Atlantic east of the South Branch became part of the Erie Railroad. Eria was one of the five owners of the Chicago & Western Indiana that provided access to the Dearborn Station.
Frank Smitty Schmidt posted three images with the comment:
Chicago map from The Railroad Gazette Apr 24 1891.
To show as much detail as possible, I split the picture into 3 parts.