Passengers of both the trains were safe in the mishap that took place around 8:30 AM.
The impact of the collision was so severe that the guard bogie of the mail train and the engine of the EMU were badly damaged resulting in the the driver and assistant of the EMU getting trapped, according to railway officials.
They were later pulled out by passengers and admitted to hospital where the driver Yashpal died.
"There was fog in the morning and the EMU driver probably could not see the signal and hit the train from behind," he said.
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After receiving signal at Palwal Railway Station, the Mumbai-Haridwar train was cleared for departure towards Delhi. But due to fog, the train was running at a slow speed. Five km from Palwal, near Baghola village, the train was hit from behind by Palwal EMU shuttle, he said.
The mishap hit road traffic on the route, disrupting the movement of about 15 trains.
General Manager of Northern Railway AK Puthia along with senior railway officials have rushed to the spot and are monitoring the situation.
Northern Railway has opened helpline numbers to provide information about the accident.The helpline numbers are 011-23459748, 1072, and 011-23341074.
Trains en route Palwal-Asaoti section, which were held up, are being cleared through another line.