Railways cancelled the service of Mahananda Express due to the poor visibility.
While Brahmputra Mail was running late by 16 hours, Rewa Expresss and Lichchavi Express were 13 and 14 hours behind their respective schedule, according to Railway Ministry data.
Railways rescheduled the departure timings of 15 trains, including Howrah Janta and Swantra Senani Express, because of the dense fog and poor visibility.
Railways have instructed the train pilots, guards, station staff and other safety related staff involved in rail operations to accord highest priority for safe train running during foggy weather.