Here are all the list of reasons for filing TDR of ticket for refund. If it is e-ticket you can simply file it online on the next day of journey day and up to maximum of 30 days. Otherwise you forfeit your right for refunds admissible.

Source: As worded by Indian Railways, Government of India

Cancellation and Refund of E- Tickets

The electronic reservation slip cannot be cancelled at any regular counter of the Railways. The electronic reservation slip can only be cancelled online.

Cancellation Before Charting

Refund Rules

Source: As worded by Indian Railways, Government of India

In such cases, you must obtain a Ticket Deposit Receipt (TDR) from the nearest major station within 30 days from the date of scheduled travel. You must then submit an application in the prescribed from( Printed on the back of TDR) to the Chief Commercial Manager (Refunds) of the Zonal Railway to which the Ticket Deposit Receipt-issuing station belongs.

Source: As worded by Indian Railways, Government of India

Source: As worded by Indian Railways, Government of India

Source: As worded by Indian Railways, Government of India