As for the post-war era, the shorter connection between Bucharest and Craiova was apparently completed in 1947, and the numbers were reshuffled such that it got number 1, the former route via Pitești got 27, and the routes to Arad and Cluj-Oradea got separated into 34 and 58, respectively.
Otherwise, it was still kind of stuck in the past. Even the explanation of timezones still talked about Amsterdam time, abolished by German occupants and never brought back, and even *gasp* about timezones in the United States!
https://timetableworld.com/ttw-viewer.php?token=28726276-6c18-47e0-8d55-4978a38ed75f
The 1948/9 timetable came with some landscape/architecture/folk pictures (similar to some interwar Polish timetables), and also notably mentions through carriages to not just Paris or Beograd, but also… "Odra", the then-misleadingly named Świnoujście station! It also came with a new map that once again showed the borders while being somewhat more schematic than the 1943 one. (1948 was the year the Communists got rid of the trappings of constitutional monarchy in Romania)
https://timetableworld.com/ttw-viewer.php?token=1fa7fd39-189b-438a-b967-8d271f38acce
Then there's a gap, and 1952 shows up with a new, much simpler line diagram that didn't distinguish double-track and main lines anymore. Lines radiated out of Bucharest, and a new, vertical, axis was drawn to anchor them - Bucharest-Ploiești-"Orașul Stalin" (Brașov, in Poland Katowice was the city that suffered that fate)-Ciceu-Deda-Beclean pe Someș (It was also quite sloppily made, many diacritics are missing). Most tables were laid out landscape, such that you would now read the book sideways. The subject matter of the pictures was made labor-related.
https://timetableworld.com/ttw-viewer.php?token=1cdf1cdf-16f2-4ba7-8564-7ee9079f5daf
The couple of later examples were even sloppier, and I will not dignify them with a comment.
10/