Dense fog and low visibility engulfed the Delhi-NCR today affecting the flight and rail operations. According to Indian Railways, 26 Delhi-bound trains have been delayed by up to four hours. These include the Gorakhdham Express, the Sampark Kranti Express, the Shram Shakti Express, the Mahabodhi Express, the Ayodhya Express, the Telangana Express, and the Gondwana Express. Meanwhile, several flights are also reported delay due to low visibility at the Indira Gandhi International Airport in the national capital. Passengers are advised to check the latest status of their flights and trains before boarding them.