What system did the Frisco use to dispatch trains on the Birmingham Division in the 1940s and 50s: TT&TO, CTC, or something else?
James, Over the broad two decade window you outlined the simple answer is - yes. You can find a more detailed response in this site's Forums, Historical, Operations, Timetables, Southern Division Employee Timetables (ETTs), Timetable Number, Effective Date. For the Birmingham Subdivision please view the following snapshots. Time Table 31, Effective August 20, 1939, pages 8-9 - Amory, MP 611.2 - Birmingham, MP 734.8 -Time Table & Train Orders (TTTO) Time Table 35D, Effective May 1, 1947, pages 10-13 - Amory, MP 611.2 - Pratt City, MP 729.3 -Time Table & Train Orders (TTTO), overlaid with Overlapping Permissive Block (OPB) signals, Pratt City, MP 729.3 to Freight Yard Junction, MP 733.5 - Staff system Time Table 36, Effective May 15, 1948, pages 10-13 - Amory, MP 611.2 - N. A. Crossing, MP 693.7 -Time Table & Train Orders (TTTO), overlaid with Overlapping Permissive Block (OPB) signals, N. A. Crossing, MP 693.7 to B. S. Crossing, MP 733.4 - Centralized Traffic Control (CTC) Time Table 38C, Effective May 10, 1953, pages 6-7 - Amory, MP 611.2 - N. A Crossing, MP 693.7 -Time Table & Train Orders (TTTO), overlaid with Overlapping Permissive Block (OPB) signals, N. A. Crossing, MP 693.7 to B. S. Crossing, MP 733.4 - Centralized Traffic Control (CTC) Time Table 41A, Effective October 27, 1957, pages 6-7 - Amory, MP 611.2 - Colsub (Columbus Subdivision Junction), MP 612.3 -Time Table & Train Orders (TTTO), overlaid with Automatic Block System (ABS) signals, Colsub, MP 612.3 - B. S. Crossing, MP 733.4 - Centralized Traffic Control (CTC) Coupled with this are associated Yard Limit, Interlocking and Signal rules and related Special Instructions. Hope this helps. Thanks! Mark