Purulia Express: লালপাহাড়ীর দ‍্যাশে যাবি? চিন্তা কিসের লো? বিকাল বেলা হাওড়া থেকে পুরুল্যা এক্সপেরেস পাবি। - Dip

I have a ticket from Rajkot to Mumbai in 12268 MMCT Duranto express. But now the train is partially cancelled and will run only from Ahmedavad to Mumbai.

My question is do I need to cancel the ticket myself OR it will get cancelled automatically?

If...
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not automatically, then when should I cancel ticket? Before chart preparation, before (original) scheduled departure from Rajkot or after original scheduled departure from Rajkot?

I want full refund but railway rules are confusing me, rules say that train needs to be cancelled. But train is only partially cancelled.

So please guide about cancellation so that I get full refund.

Thank you