Is that detailed enough for you? If not, please remember that these reports are requested by Congress, so they have to be dumbed down to their level. In fact you could make the argument that "teenagers who know nothing of railroads" begins to describe much of the intended audience in Congress as well.
Corection duly noted. Now that you have put up the quote, I remember reading it in the report. (What can I say? My memory is not so great any more.)
The 7 miles at 20 mph I do not understand. Otherwise, the speed limits seem appropriate to the conditions. The Mobile - Flomaton - Pensacola dogleg is not going to go away. There is simply not enough east-west traffic to justify building a direct line. Historically the railroads into Mobile and into Pensacola were built to connect the hinterland with a port, so there was no push for a line between these points during the late 1800's early 1900's railroad building era.