I have travelled a few times by Train No 12687 the Chennai (Madurai of recent) Dehradun Express. I was late all the time by 3 to 5 hours. I am set to travel on 14 Nov '13. The train was 5 hrs 55 mins late on 2 Nov '13. Why is the train so much time behind schedule mostly? I think the delay is between NZM and DDN.