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The Railwire is not your personal army.
Others more knowledgeable on Colorado railroads will be able to give a better answer, but considering the scope and Era of those prototypes they all likely used timetable and train orders to control the movement of trains.Likely the only signals would be train order signals at stations, and possibly signals at interlockings (however considering the early Era and branchline nature of the lines unsignaled manual interlockings are also a real possibility)
Based on your other thread... The Colorado Midland had no signaling during its life, and neither did any of the narrow gauge lines of the D&RG, RGS, or C&S save for train order boards at the stations. In later years the D&RGW used signaling on its standard gauge lines, but probably not until the 20s. By then the Colorado Midland was scrap metal.
Create anachronisms and updated power for the Midland ensuring I never grace the pages of Model Railroader. Hmmm
The 1920s were a boom era for the Grande, and once again Tennessee Pass was a significant bottleneck. Recognizing that the largest productivity gains were to be had in the single-track sections, the Rio Grande installed 6.8 miles of Centralized Traffic Control (CTC) signalling between East Tennessee Pass and the beginning of double track, just past the Pando Tunnel. One long siding was added in the middle - 2.6 miles of track between East and West Mitchell. This was the first CTC installation west of the Mississippi, and the Rio Grande's first step into signals. Also in 1928, those sections of the line not outfitted with CTC were given Automatic Block Signals (ABS).
The next major change came in 1958. With dieselization complete, not as many helpers would be needed, alleviating some of the traffic between Minturn and the summit. Also, installations of CTC elsewhere on the Grande had convinced the railroad of its worth in keeping traffic moving. So, much of the second main from Minturn to Deen was pulled up and replaced with long sidings, and the entire stretch was placed under CTC control. This, along with the Kobe-Tennessee Pass and Minturn-Avon stretches, marked the last sections of the D&RGW mainline to come under CTC.