No casualty or injury was reported in the incident.

Muhammad Kashif, public relations officer of the Pakistan Railways’ Quetta division, told Dawn.com: “A bomb attached to the railway track exploded loudly, derailing six bogies of the train. Fortunately, there was no loss of life.”

The incident happened close to the Spezand station in Mastung’s Dasht area.

The blast occurred when the train was on its way from Quetta to Peshawar City station with 350 passengers on board.

“Security forces and rescue teams rushed to the site as soon as they were alerted about the incident, and began a search operation after cordoning off the area,” Kashif said.

“Four bogies of the Jaffar Express had been placed back on the track, while efforts were underway to restore the other two,” the official noted.

A relief train later brought back all the passengers to Quetta.

Meanwhile, the services of  Jaffar Express and Bolan Mail have been suspended till August 14, which marks the country's Independence Day.

The Quetta-bound Jaffar Express recently escaped a major disaster when the bomb planted on the railway track exploded just minutes after the passenger train crossed it.