For RailFans, the Journey itself is the Destination. - Sreerup Patranabis

No.

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Not required... If train is cancelled from Railways end you need not cancel/File TDR from your end it will be cancelled automatically and full refund will be credited back to account of booking. Only if its a Counter ticket you need to go and cancel it and get money refund across counter.

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It is not necessary.

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If train cancelled by IR and i cancelled ticket before departure
Should i get full refund??

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Yes full refund

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