The national capital continues to grapple with biting cold and fog, causing delays in flight and train operations.<br />''<br />''According to the Indian railway around 18 trains bound to Delhi are running late. As per the Ministry, the long-distance train Puri-Nizamuddin Purushottam Express is running approximately 6 hours behind schedule.<br />''<br />''The five other trains are also experiencing delays ranging from 3 to 5 hours.<br />''<br />''Meanwhile, Dense fog prevailed in parts of Delhi and adjoining states as coldwave conditions continued.<br />''<br />''According to the India Meteorological Department, very dense fog was witnessed in isolated pockets of Punjab, Haryana, West Rajasthan, and Bihar at 5.30 am today.<br />''<br />''The weather department also said dense to very dense fog conditions are likely to prevail over north India for the next five days.<br />