Volvo takes 10 hrs coz it going to halt at one or two places. There are three trains from Chennai to Hyderabad one is via Renigunta loco change to Diesel and several halts. Second one is Chennai exp via Gudur and Guntur Loco change takes place and it has several halts. Third one is Charminar exp Though it is having wap 7 it covers longer distance via Bza and warangal and has several halts. Comparing these trains with Volvo is unnecessary coz Volvo travels in a shorter route and with only a single or dual halts.