Yeah, pretty much. I had shared the timetables from the MG period (SR timetable 1961) in another post a few months ago.
/blog/post/3836568
BVRM/MTM-BZA was converted in 1962. BZA-GNT parallel BG line was opened in 1964 (Tadepalli-GNT MG line was present till late 80's, but with no passenger traffic).
NDD-NS used to have frequent diesel rail car services. 60's lo Kakinada-Narsapuram madhya 4-coach...
more... slow express okati undedhi, (2 diesel rail cars at either end of the rake with two normal coaches between them).