In 1881, the "cutoff" opened between Godfrey and Wann, bypassing the main part of Alton and presently used by Amtrak. While the original route through Alton was eventually abandoned. At its peak, the only single track segments were between Rinaker and Plainview, and between Godfrey and Wann. Early CTC installations on those segments were originally controlled from various towers as linked below.
Radio Frequency - 161.280 (AAR Channel 78) (Bloomington-Iles)
Radio Frequency - 160.695 (AAR Channel 39) (Iles-Hazel Dell)
Radio Frequency - 161.280 (AAR Channel 78) (Hazel Dell-Carlinville)
Radio Frequency - 160.560 (AAR Channel 30) (Carlinville-Wann)
ITALICS INDICATE ABANDONED SEGMENTS
126.4 Bloomington Yard
126.5 BN Target (NS crossing)
126.6 Bloomington
132.2 Shirley
136.3 Funk's Grove
140.9 McLean
145.8 Atlanta
150.0 Lawndale
155.7 Athol (CN crossing)
156.4 Lincoln
163.4 Broadwell
168.4 Elkhart
173.0 Williamsville
177.6 Sherman
182.9 Ridgley (I&M crossing)
185.1 Springfield
187.4 Iles (junction-NS)
188.9 Hazel Dell (junction-NS)
194.3 Chatham
200.0 Auburn
207.0 Virden
210.8 Girard (BNSF crossing)
213.1 Nilwood
223.8 Carlinville
225.9 Rinaker
234.3 Plainview
238.3 Shipman
246.0 Brighton
252.1 Godfrey (junction-KCS)
256.8 Alton/Amtrak-College Ave.
259.6 Wann
252.1 Godfrey
257.5 Alton
262.1 Wann
1 track, CTC in use.
Operation via NS between Iles and Hazel Dell.
This line is being upgraded for high speed operation, resulting in some changes.