India is gravitating towards two distinct types of train with rolling stock appropriate for them:
1. Overnight trains with sleeping accommodation. The most popular sleeping accommodation in India is the 3 tier sleepers with bays of 6 berths and two berths along the corridor on the opposite side from the bays. Only First Class AC has compartments. Nothing else has compartments, other than semi private bays for women in the regular sleepers.
2. Day trains with Chair Cars, which are basically like what are called Coach these days in the US. They come in four varieties non AC regular and executive, and AC regular and executive. Regular is 2x3 Executive is 2x2 seating.
They appear to be progressively getting rid of everything else including the so called 2 Tier AC Sleepers, though eventually they may be retained for the Rajdhani type trains.
So in general rooms are out except for the highest class of travel, a class that is not available on most trains.