This old line runs along West Carroll Avenue -- a street in River North many people don't even know exists. It carried newsprint to the old Chicago Sun-Times Building before trucks made the line redundant. This was long before the Sun-Times building was torn down to make way for the Trump International Hotel and Tower (401 North Wabash Street).
Mayor Daley would like to use the tracks to run a trolley or light rail service from Union Station to Michigan Avenue. But these days a lot of Hizzonor's dreams are going unfulfilled for reasons that are beyond the scope of this blog.
Interestingly, the reason the old Sun-Times Building was located along the Chicago River is the same reason the Chicago Tribune's current print house at the Freedom Center (777 West Chicago Avenue) is also located on the river -- so that newsprint could be brought in by barge. I've never seen any old pictures of newsprint being unloaded at the Sun-Times site, and I've read that the Tribune has never used its barge unloading capability at the Freedom Center.