Is it safe to rely on this train's punctuality?I am planning to do a break journey from Secunderabad to Coimbatore.As of now,it is impossible to get a conformed ticket in Sabari Express and Bus costs almost around 2000 rs.So,i am planning to Take this train to chennai and Coimbatore Shatabdi from Chennai to Coimbatore?I need to book tickets as fast as possible,so any advice would be very helpful to me.