Between 1905 and 2008, between Plaines and Pequot, Santa Fe had a paired track arrangement with Chicago & Alton and various successor railroads. And that segment did not have complete CTC until the early 2000's. And in 2008, the connection was broken at Pequot with Alton successor Union Pacific, and Santa Fe successor BNSF assumed complete control of the paired track.
East of Ash Street, the line which primarily accommodated passenger trains serving Chicago was abandoned. Ash Street was previously a crossing with other railroads including the now abandoned Pennsylvania Railroad. In recent years, a new track was constructed along the former Pennsylvania Railroad right of way, connecting with the former Burlington main line. Now part of the same BNSF Railway. This new track is now identified as part of the main line.
Radio Frequency (NS Connection-McCook) - 161.385 (AAR Channel 85)
Radio Frequency (McCook-Pequot) - 160.650 (AAR Channel 36)
ITALICS INDICATE ABANDONED SEGMENTS
0.0 Chicago
1.3 C&WI Jct.
1.4 21st Street (PRR crossing)
3.2 Bridgeport
4.4 Ash Street (B&O/PRR/CJ crossing)
2.8 Chicago Subdivision Connection
3.1 Stengem
4.1 31st Street
4.3 Ladue (CN connection)
4.6 CP 46
4.8 Draper
5.8 California
5.9 Corwith (CN crossing)
6.3 Pulaski
7.3 Nerska (BRC crossing/remote-BRC dispatcher)
12.9 McCook (IHB crossing/remote-IHB dispatcher)
13.1 CP 134
14.4 Harbor
15.2 CP 151
15.6 CP 155
17.2 Willow Springs
17.3 CP 173
17.6 CP 176
19.3 CP 193
23.0 Argonne
25.1 Lemont
29.4 Romeo
32.7 Lockport
36.1 CP 360
36.3 Joliet Yard
37.7 Joliet Union Station (Metra crossing/remote-Metra dispatcher)
41.6 Plaines
46.0 CP 460
46.1 Millsdale
46.6 CP 465
47.0 Logistics Park
47.4 CP 472
48.2 CP 482
49.6 CP 496
50.3 Blodgett
52.5 Lorenzo
55.2 CP 550
57.1 Pequot
2 tracks, CTC in use, controlled by dispatchers in Fort Worth, Texas. DS1 Dispatcher controls trackage CP 46 to Romeoville, DS25 Dispatcher controls trackage Romeoville to Pequot.
Track diagram of segment between Chicago and Coal City, as of early 1950's, prior to installation of CTC. Between Joliet and Coal City, line was a paired track with Gulf Mobile & Ohio.