Once you get your guide, there are several differences from today's timetable you will notice. Some of which I think you already know.
More details on sleepers. More types of rooms and many different floor plans. Everything was NOT just a 10 roomette 6 double bedroom. And the car numbers were usually shown. And the numbering pattern was not always the same consistency as it is today. You will find yourself questioning why some of them are what they are.
Only some trains had reserved seats in the coaches. And that really did mean an exact space at the time you made your reservation. Car 5, Seat 20. The number of coaches and sometimes the numbers of seats in the coaches was often shown on trains which had reserved seats. Other trains it just said "coaches" leaving you guessing how many coaches a particular train had.Many lines still listed the coaches as having reclining seats. Actually that was mostly a relic by the 50's.
Usually the first pages of a timetable showed equipment and condensed schedules of main trains. That was followed by a section showing ALL the local stops and some trains so slow and insignificant as to not even be listed in the first part of the tables. These trains were usually primarily for mail.
Many trains were operated by more than one railroad. For example, the California Zephyr ran from Chicago to Denver on the Chicago Burlington and Quincy. Then from Denver to Salt Lake City on the Denver and Rio Grande, Then Western Pacific from Salt Lake City to Oakland.
That normally meant a change of locomotives at least every time you changed railroads but of course the timetables did not mention that.One train which was a glaring exception to this was the South Wind usually handled either by Pennsylvania locos all the way from Chicago to Miami or an Atlantic Coast line, when actually two other lines participated in this operation as well.
NOW....from point above.....to see the full scope of equipment and local stops and other trains on the same lines you normally had to go to all the timetables involved to get the complete data for a given train. Not as simple as it is today. Maybe one reason trains almost went out of existence is that they could be hard to understand.
The old timetable/Guide sometimes said something about baggage and dorms but usually not anything about mail cars. So, the RR Guide, as thick and juicy as it looks, still was not not a substitute for seeing the train in person due to non reserved coaches, head end, etc. Yet, you usually could get exact info on sleepers, diner, lounges and reserved seat coaches.
You will find many more cars added and subtracted en route for traffic pattern reasons, and set out for sleeping in convenience than today. Lots more switching around today proportionately.