You are right. Attached is the response by SR authorities when I had raised an issue of the heavy slack time of Mumbai-Kanyakumari express slack time between Thrissur-Ernakulam wherein 2 hours have been allotted to cover approx 70 km. They simply gave another response least related to the concern I had raised !!! This is Southern railway for you....at least in Kerala they seem to be least interested in speeding up trains