The 1930s are represented by one Hermes timetable (August 1935) and three official CFR timetables (June 1934, October 1938, May 1939). The former hadn't changed much in form other than that the map was improved just the bit it needed and timetables of S. A. Mera buses in Transylvania were added.
The CFR timetables are… kind of a contrast, I suppose. Within their pages, only one non-Romanian language has any significant standing - that being French (English, German and Hungarian only make an appearance on the title pages for the individual sections). They have little third-party advertising. And the simpler table design would define Romanian timetable for the next half-century - the notable feature that makes it stand out to me would be the table number being placed in what I've come to call the "directorate field" (the big cell in the train number row and the station column). The pre-war timetables also repeat the station column on the right when a table is laid out as a vertical spread across two pages and usually include line diagrams of the route in the table and connecting lines on the side, actually using a lot of space (half a page) to make it easier to keep track of where you are - wartime and post-war cost cutting would put an end to that, at least for a time.
Another thing I'd like to note about those: separate rows for both timezones where they changed! It seems both CFR and Hermes did it, and think it rather helps with scanning the times a fair bit.
https://timetableworld.com/ttw-viewer.php?token=44d7004d-7a18-4727-8175-d4c466d82510
https://timetableworld.com/ttw-viewer.php?token=8805b979-1541-45cd-bd70-6591ce2cb47f
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