New Delhi : At least 70 trains were running late and were 23 rescheduled due to dense fog in parts of north India on Friday morning, a railway official said here. According to the Northern Railway official, the trains which were rescheduled included the New Delhi-Rajendra Nagar, New Delhi-Howrah, New Delhi-Sealdah and New Delhi-Bhubaneshwar Rajdhani expresses.-WTN