Suppose, the 3A fare on the starting day of booking is INR 795. On the previous day of journey it reaches INR 2500, due to dynamic fare. One person boarded this train after charting due to vacant seat with Gen ticket of express train & request TTE to arrange a ticket for him, by paying the difference upto a certain station. Now how TTE will calculate the difference. Because, upto charting how much the dynamic fare raised, should not be known to TTE.