At least 70 trains were arriving late in Del area, 22 trains were rescheduled while 7 trains were cancelled due to dense fog in parts of north India on Wednesday morning, a railway official said.
Three International flights have been delayed while seven Domestic flights have been delayed.
According to the Northern Railway official, Sampoorna Kranti Express was running 26 hours behind schedule, Bhagalpur-Anand Vihar Garib Rath and Bhagalpur-New Delhi Vikramshila Express were running 23 hours late and Vaishali Express was 25 hours late.
The cancelled trains comprised the Delhi-Malda Town Farakka Express, New Delhi-Puri Express, Firozpur Cantt-Delhi Sarai Rohilla Intercity Express, New Delhi-Rajendra Nagar Sampoorna Kranti Express, New Delhi-Manduadih Super Fast Express, Habibganj Shatabdi and Lucknow Swaran Shatabdi.
The weatherman said the maximum temperature in Delhi is expected to remain unchanged for the next two days.
The minimum temperature may rise by one degree on Friday.