At least 13 trains were cancelled and 88 trains were running late due to dense fog on Sunday morning, railway officials here said.

"At least 88 trains were running behind schedule and at least 38 trains were rescheduled," a Northern Railway official told IANS.

"The entire North India has been effected by the heavy fog today (Sunday)," the official said.

The 22823 Bhubaneswar Rajdhani Express was running 22 hours behind schedule and 12303 Poorva Express was running late by 29 hours, the official said.

According to officials, at least 88 trains were running late by more than two hours. 

The official further said that the railway has rescheduled 12 trains on Sunday.

Among 13 cancelled trains were 12310 Patna Rajdhani Express, 12393 Sampoorna Kranti Express, and 22811 Bhubaneswar Rajdhani Express.

Meanwhile, according to the Delhi International Airport Limited (DIAL), which manages operations at the Indira Gandhi International airport here, no flight was cancelled on Sunday.