Just a further comment on that summer of '48 timetable...
When I worked for Greyhound in Omaha in 1971thru 1973, we still had 6 daily trips to Cheyenne, another just to Grand Island, and one to Norfolk via Columbus. 3 of the 6 to Cheyenne that 'discharged only' in Lincoln (due to a traffic restriction in favor of Continental Trailways), and we also ran 3 shuttle trips to Lincoln and back. In the summer, we added 3 express trips, 2 of which branched off at Big Springs Jct. to Denver via I-76. Even with all that service, most trips had at least one extra section, and sometimes 2 or more. Going East of Omaha, we had even more service via both I-80/US-6, and via US-30.
In addition to our service, Continental Trailways had 4 daily trips, 3 to Denver, and 1 to Cheyenne and beyond. Amtrak had the daily SFZ via the BN to Denver.