New Delhi/Kanpur, Jan 5 (ANI): As cold wave continues to lash northern India, train traffic remained disrupted in the region on Monday due to thick blanket of fog. As night temperature plunged further at several places in the region, people who work outdoors were seen seeking warmth from bonfires and hot tea from roadside stalls. In the national capital, New Delhi, passengers at the railway stations complained of long delays in the scheduled timings of trains. Dense fog affected the train traffic in northern Kanpur city as well, where light rains added to the woes of the passengers. The sudden dip in temperatures is said to have been caused by snowfall in upper regions of Himalayas and has adversely impacted the upper half of the country.