It depends on TTE. If he understands then problem solved. If not be ready to pay the fine of travelling without ticket. If tickets are available book a fresh ticket. Loss of 120 is better than paying fine.
Shouldn't be much of a issue, Inform TTE about the mistake and carry Valid Original ID they will accept it...Unless its a concessional ticket you may have to pay extra fare.
He may ask for a bribe of 100 rs as per my info... Once a pax in malwa ex did the same mistake and then tte take him to the toilet side and ask for so much fine and says saste me nipta dunga 100 rs me.. 😂
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