As per the Statistics:
1 Passenger earnings dropped by 1% in FY 2015 which offset by Freight Earnings increase by 1% in 2015 than 2014.
2 Second Class earnings and AC Class earnings are most than Sleeper Class Earnings.
So, Passenger amenities like Good Food, Punctuality, Cleanliness, etc can't be neglected.
Safety...
more... & Security of Passengers is also required to be properly maintained.
As per the statistics if IR introduce AC Trains more it may give more revenue.