Least punctual train

The Guwahati Express from Guwahati to Trivandrum is reputed to be the most unreliable long-distance train in the country. The train is booked to make its journey in 65 hours and 5 minutes, but the average delay on a trip is about 10-12 hours, with the train often showing up more than a day late. In 1995 the Times of India carried an article on it, saying that the train had not run on time even once in its (then) ten-year existence!