Section 3(2)(a) in Railway Passengers (Cancellation Of Ticket And Refund Of Fare) Rules, 1998
(a)if the ticket is presented for cancellation more than forty eight hours in advance of the scheduled departure of the train, a minimum per passenger cancellation charge shall be deducted at the flat rate of rupees one hundred and twenty for air conditioned first class/executive class, rupees one hundred for airconditioned-II tier/first class, rupees ninety for airconditioned III-tier/3 economy/airconditioned chair car, rupees sixty for sleeper class and rupees thirty for second class.