For e-tickets (IRCTC online):
Not a problem at all:
- Login to IRCTC.
- My Account → My Bookings.
- Print or save PDF of the ticket.
- Show on phone or printed at TTE check.
There is no "lost" e-ticket — it's always available digitally.
For counter (paper) tickets:
- Visit the issuing reservation office (or any major reservation counter).
- Apply for a duplicate ticket before the train departs.
- Pay duplicate fee:
- II / Sleeper: ₹50 - 1A / 2A / 3A / CC / EC: ₹100
- Carry valid photo ID.
- Duplicate ticket issued — valid for travel.
During journey (if you lost it on train):
- Inform TTE immediately.
- Show alternative proof (booking SMS, ID).
- TTE may allow continued travel based on records.
Refund on duplicate ticket: No refund on duplicate fee.