A couple from Nagpur, who was returning by the ill-fated Jnaneshwari Express after a honeymoon vacation to Darjeeling, are yet to be traced.
Amit Gajbhiye and his wife Anita were among the passengers who boarded the train at Howrah station.
Both had spoken to their parents before leaving for Nagpur, family said.
After the news of the mishap, parents of the couple rushed to Nagpur railway station to enquire about their whereabouts.
They also scanned the list of the dead and injured travellers admitted in three hospitals at Kharagpur and West Midnapore, they said.
They reached the mishap spot later and are on the look out for the couple since then.
"Here family members are anxiously awaiting a call but even after four days, there is no news from anywhere," they said.