Several trains are running late due to obstructed visibility after dense to very dense fog was observed in some parts of the country. According to Northern Railways, around 16 passenger trains to Delhi were running behind the schedule by an hour to six hours today. These trains include Bhubneshwar New Delhi Rajdhani Express, Puri – New Delhi Express, Rewa Anand Vihar Express, Jammutavi Ajmer, Howrah – Kalka &nbsp;Express, and others.&nbsp;<br />”<br />”<br />