Joliet Subdivision

FORMERLY Chicago & Alton Railroad/Gulf Mobile & Ohio Railroad
DOUBLE TRACK constructed 1869-1870 (Mazonia-Odell)/1888-1893 (Odell-Bloomington)
ABS installed 1900-1903
COLOR LIGHT ABS installed 1927 (Joliet-Mazonia)
CTC installed 1955 (Normal-Bloomington)
CTC installed 1966-1968 (Mazonia-Normal)/second track eliminated
PASSENGER SERVICE: Amtrak St. Louis Route

Between Joliet and Mazonia, trains formerly had a second route available. That route involved the Pequot Subdivision route to the west, via Coal City. But the connection at Pequot was broken in 2008.

Radio Frequency - 161.280 (AAR Channel 78) (UP)

Stations/Milepost Locations

Direction is southward from Joliet to Bloomington
Distance is from Chicago

36.7 Jackson St.
37.3 UD Tower (crossing-remote-Metra dispatcher)
38.5 South Joliet
45.8 Elwood
52.5 Wilmington
54.5 Hitt
57.3 Braidwood
60.5 Mullins
62.6 Mazonia (junction-UP)
64.5 Gardner
72.8 Dwight (NS crossing)
82.0 Odell
86.9 Cayuga
92.5 Pontiac
97.8 Ocoya
102.3 Chenoa (TP&W crossing)
106.6 Ballard
110.5 Lexington
118.5 Towanda
121.5 North End 2 Tracks
124.1 Normal
126.0 Bloomington Yard
126.5 BNSF Target (NS crossing)
126.6 Bloomington

Joliet to Mazonia via Wilmington: 1 track, Track Warrants in use with automatic block signals. It is possible that CTC has recently been installed over this segment, but this is not been confirmed.

Mazonia to Bloomington: 1 track, CTC in use. Some segments of 2 tracks.


Significant changes are under way in Joliet, as the station is reconfigured. In May 2015, UD Tower was closed, with control transferred to the Metra dispatcher.

South of Joliet, the line is being upgraded for high speed operation, resulting in some changes. Google satellite and Street View images reveal the installation of new signals between Joliet and Mazonia, and a new siding under construction at Braidwood.

Classic Track Diagrams

Track diagram as the line existed around 1975, when sidings existed between Joliet and Mazonia. CTC was installed between Chicago and Joliet around 2000.


Known discontinued passenger railroad stations. Includes zoomable Google maps.


Past and present towers and interlockings.