Franklin Campbell And Oakdale just east of there
John LaRochelle Controlled by the C&WI operator at 81st Street Tower per the C&WI Special Instructions and Speed Restrictions in effect February 26, 1974, Speed Limit 30 MPH for trains moving on the C&WI.
I just discovered Chicago and Northern Indiana Railroad Interlocking Towers. It provides a Flickr photo link that has the comment:
A southbound Missouri Pacific caboose hop behind GP50 No. 3521 is seen on the C&WI Dolton Branch about to cross the Rock Island South Chicago Branch at Oakdale.
This was Mile Post 10.1 on the C&WI's Dolton Branch (approximately 91st Street). Oakdale was a station stop for C&WI suburban trains until 1964. The crossing with the former Rock Island South Chicago Branch (in foreground) was controlled remotely by 81st Street Tower when this photo was taken in the summer of 1981. C&WI's Dolton Branch went from two tracks to four tracks just north of the crossing. The MP caboose hop has used the southward passenger main from 81st Street and is enroute back to Yard Center to tie up after delivering an intermodal train to Canal Street Yard. UP currently owns the C&WI Dolton Branch and only the two freight mains (at left) remain today.