42 trains are running late in the Northern Railway region due to fog. Northern Railway said Puri-New Delhi Purushottam Express, Pratapgarh-Delhi Padmavat Express and Gaya-New Delhi Mahabodhi Express are running late by 4 and a half hours. Other trains which are running late include Darbhanga-New Delhi Bihar Sampark Kranti Express, Kamakhya Delhi Brahmaputra Mail, Kathgodam Jaisalmer Ranikhet Express and Malda Town Delhi Farakka Express.   <br />''<br />''<br />