New Delhi [India], January 15 (ANI): As many as 18 Delhi-bound trains were reported running behind schedule due to fog, railway officials said on Monday. Flight services were also disrupted in the national capital with visibility dipping. According to the India Meteorological Department (IMD), dense to very dense fog conditions are likely to continue over north India during next four to five days. Northern Railways reported that the Katihar-Amritsar Express was delayed by about five hours while Hyderabad-New Delhi Express and Jammutawi-Ajmer Pooja Express trains reported delays by around six t…