For Ms- Kacheguda exp Loco change happens at Renigunta. After Renigunta it's Diesel Route. I din't say that Loco reversal takes place at Gudur and Guntur. What I said is " Second one is Chennai exp via Gudur and Guntur Loco change takes place and it has several halts". I mentioned It runs Via Gudur and Guntur and for this train Loco change happens at Guntur.