Extend the Train 13187/Maa Taara Exp upto Bhagalpur. There is no express train in morning for Pakur-Sahibganj-Bhagalpur. People who comes from Chennai to go Bhagalpur by 12840/Chennai-HWH Mail, can easily go from Maa Taara Exp.
There are many trains upto RPH/Rampur Hat, all can be extended upto BGP/Bhagalpur.
The passenger of Chennai-Bhagalpur wait the complete day at Howrah, either they come by 12842/Coromandal or 12840/HWH mail. Because all the three express Trains [aya Exp, Jamalpur Exp, Varanasi Exp] departs at night only from HWH.