Twenty people were killed in the train crash and 74 were wounded, with some in critical condition, according to Javed Ahmed, a physician treating the wounded.
He said that heavy machinery was being used to rescue passengers who were stuck in the train, adding that they were being provided with food and water.
Photo taken with a mobile phone shows people gathering at the train accident site in Pakistan's eastern city of Rahim Yar Khan on July 11, 2019.
The accident, the latest in a series of similar incidents, occurred in Punjab's Sadiqabad district - some 543 kilometers (337 miles) from the provincial capital Lahore - when a passenger train collided with a freight train parked on a parallel track, Deputy Commissioner Sadiqabad Jamil Ahmad told reporters.
The engine of the Akbar Express appeared to be destroyed and at least three carriages were derailed in the collision, Salamat said.
Authorities said the Pakistan Army was also taking part in the rescue efforts.
Prime Minister Imran Khan and President Arif Alvi have expressed deep sorrow over the loss of lives in the train accident.
Khan said on his official Twitter account that he has asked the railways minister to take emergency steps to counter decades of neglect of railways infrastructure and ensure safety standards.
The cause of Thursday's crash is under investigation but Railways Minister Sheikh Rasheed Ahmed said human error was believed to be responsible.
He announced a monetary compensation of Rs1.5 million for the families of the deceased and Rs0.5 million each for the injured.
At least 13 passengers were killed and several injured when a passenger bus carrying over 50 people overturned near Attock area of Punjab province, local media reported.
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