The naxalites blasted the up and down tracks and also fired upon the locals who rushed to the spot on hearing the explosion but no one was injured.
RPF and GRP personnel have reached the spot and the up track has been restored, Chandra said, adding traffic would resume after police clearance. The down track would also be opened for traffic in the next couple of hours, he added.
Nearly 15 trains, including Hatia-Gorakhpur Maurya Express, Howrah-Danapur Express and Amritsar-Howrah Punjab mail were halted at several places under Danapur and Asansol divisions.
The maoists had blown up tracks near Bhalui halt during a bandh last month.
In another incident, the maoist rebels blew up the single line between Kajra and Urain stations on Kiul-Jamalpur section of Eastern Railway at 3.45 am, its Chief Public Relations Officer, Deepak Jha, said.
Track restoration work is on and it would be opened for traffic after police clearrance by 10 am, he said.