Railway officials confirmed that trains running late include the Himgiri Express (26 hours), Amarnath Express (20 hours), Purbia Express (18 hours), Kaifiyat Express (19 hours), Avadh-Assam Express, Punjab Mail, Kota-Patna Express, Nauchandi Express, Bihar Sampark Kranti Express, Gareeb Rath, Mau-Anand Vihar Express, Triveni Express and many more.The MeT department predicted that skies are expected to remain clear as the day progresses. At least eight international flights were cancelled and three diverted Thursday due to poor visibility. Five domestic flights were also delayed. Occupancy on state run buses has come down to half its capacity. Moderate to dense fog has been observed over various parts of North India. Cold wave previously hit Delhi.