i have a reserved 2ac ticket under senior citizen fare for sampark kranti express. If while on board 1ac berth is available in the train, can i upgrade the same to 1ac by paying the difference for senior citizen fare. i.e fare for 1ac under senior citizen less what i have already paid for 2ac fare. ( I had asked the same quiry under blog no.383193 , but i got contradictory reply one each to the quir. will any body enlighten me the correct position, pkrmn