According to the flexi-fare system, which came into force on September 9 last year, only 10 per cent of the seats are sold in the normal fare category and thereafter, prices increase by 10 per cent with every 10 per cent of berths sold, with a ceiling of 50 per cent.
Railways is considering either raising the basic fare by 15 per cent flat or reserving about 50 per cent berths in premier trains for normal fare.
Taking note of vacant seats in long-distance Rajdhani and Duronto trains and a few Shatabdis, Railway Minister Suresh Prabhu had sought a review of the system to make it more passenger-friendly.
Various models are being discussed and a decision will be taken this month to revise the flexi-fare structure, he said.
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Railways has earned about Rs 260 crore from the system till date and aims to touch the Rs 500 cr-mark in a year.
"A few changes will be made to make the premier services more passenger-friendly so that the occupancy rate goes up," he added.