Section 10(1) in Railway Passengers (Cancellation Of Ticket And Refund Of Fare) Rules, 1998
(1)Charge of reservation shall be allowed on a reserved ticket of lower class for higher class on the same train and day or when reserved for a seat in a class for reservation of a berth in the same class on the same train and day, without levying and cancellation charges but on payment of fresh reservation fee for higher class/birth, provided that(i)accommodation is available, and(ii)the request for change is made(a)either during the working hours of reservation office and up to six hours before the schedule departure of the train; or(b)during the course of journey in the train.
