Authorities confirmed that one bogie of the train was completely destroyed, while nearby houses and vehicles also suffered heavy damage in the explosion near the railway track.
The banned Baloch Liberation Army (BLA) has claimed responsibility for the "Fidayee" attack, stating that the assault targeted Pakistani army personnel traveling on the train from Quetta Cantt.
Security forces have sealed off the area as rescue and investigation operations continue.
An emergency was also declared in government hospitals across Quetta, with doctors and medical staff summoned to handle the situation.
Railway authorities said the Peshawar-bound Jaffar Express was stopped at Quetta Railway Station after the blast as a precautionary measure.
Babar Yousafzai, the spokesperson to the home minister, said that all relevant institutions have been placed on high alert following an explosion in the city.
He urged the public not to gather near the blast site to ensure safety and allow emergency teams to carry out rescue operations without obstruction.
Hossein Amiri - Mahboubeh Habibi
