ID checks
"We walked for a long time through the mountains to reach the nearest station. I haven't eaten since I began fasting this morning, but I still can't bring myself to eat," Allahditta added, in reference to the Muslim holy month of Ramadan.
One passenger described gunmen sorting through identity cards to confirm who was from outside of the province, similar to a spate of recent attacks carried out by the Baloch Liberation Army, which has claimed credit for the seige.
"They came and checked IDs and service cards and shot two soldiers in front of me and took the other four to, I don't know where," said one passenger who asked not to be named, after walking four hours to the nearest train station.
"They checked IDs and those who were Punjabis were taken away by the terrorists," he added.
The BLA claim the region's natural resources are being exploited by outsiders and has increased attacks targeting Pakistanis from other regions.
Late on Tuesday, survivors walked through rugged terrain to the nearest train station and travelled to Mach, about 200 kilometres (124 miles) from the Iran border.
The first trains carrying survivors arrived late on Tuesday evening to be met by paramilitary forces and doctors.
"I am treating two (police) officers, one was shot five times, while the other was wounded in his knee," said paramedic Qazim Farooq.