Sir I have personally traveled and witnessed trains covering the distance in about 55 minutes in the early morning! I know about the speed restrictions. I have traveled innumerable times on this route. I'm sure that you cannot say I don't know much about it. The speed restrictions are between Madukarai and Chullimada cabin. From CBE to MDKI (excepting PTJ where they have to switch tracks) and CLMD to PGT trains can travel at around 100 kmph. So trains usually cover this section in about an hour. I have made this train take 55 minutes. There is not much difference.