states: "St. Charles Air Line is a connection between Metra 16th St. Interlocking and BNSF Union Ave. BNSF and UP jointly own the line between Union Ave. and a point 70 feet west of the Bascule Bridge over the South Branch of the Chicago River. CN owns the line from that point to 16th St. ... Both tracks are designated Non-Main Track, CN Rule 520 applies, and is also designated East-West. The north track is Track 1, and the south track is Track 2. ... The bridge is controlled by CSX Bridge Tender." See also St. Charles Air Line Bridge References Railroad History Database Brandi McLoughlin, Portrait & Biographical Album of Whiteside County (1885) Green Diamond #43 November 1996, publication of the Illinois Central Historical Society Rail lines in Illinois Illinois Central Railroad Michigan Central Railroad Chicago, Burlington and Quincy Railroad Chicago and North Western Railway BNSF Railway lines Union Pacific Railroad lines Canadian National Railway lines