This is very interesting. It would be helpful to see the original version used by engineers in the field.
By the way, that is sometimes a good strategy for information design: see what the insiders do to display their data, and then surface and revise the insider-design for outsiders. The content understanding of the insiders informs the design for users. So see how the insiders understand their information.
For many years, railroads planned schedules internally by means of graphical timetables. I tried to surface these designs for New Jersey train and bus lines (see Envisioning Information, pages 45, 107-110). About 15 years ago, I made an elaborate and extremely complex graphical timetable for the Morris & Essex train lines combined with aerial photographs of the route (so every rider could see where they lived); the printed version sometimes turns up in shows of my work.
-- Edward Tufte