W Neal: I think that was part of the reason it was printed. Most modelers back then, by necessity, were "railroad modelers". One had to build the models, of almost everything, before running a train. This guy wanted to be a "model railroader", in the technical sense of "model", meaning to simulate something. He wasn't interested in building trains, he wanted to run a railroad!
There was also someone, in the 70s or 80s, back when computers at home were rare, who "modeled" the Clinchfield digitally. He programmed his computer, not easy then, to control a CTC panel, so that he could run his chosen portion. "Staging" was provided by the computer, and he controlled the signals and switches on his portion, as the trains appeared. Again, no railroad models, just modeling a railroad.
Now, of course, we have train simulator programs that can let one do that, or be the engineer, off the shelf.