Really, very strange reply from the officials.
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If a HWH bound train reaches almost on time at KGP (or not more than 15 mins delay), it generally doesn't get delayed by more than 15-20 mins at HWH. it is from my past experience. Trains which have early morning arrivals at HWH (e.g. MAS - HWH Mail, CKP - HWH Passenger), sometimes reach before time there. As I already told you before, getting a PF clear in HWH New Complex during rush hours sometimes becomes non-trivial.