Though the idea provided by @kcanoopnair is very good. Since I have never been in 2S and never travelled this Egmore-Manglore route and Am travelling alone. I have decided to go in 16859/Chn Egmore-Manglore in Second Seating class. I have window seating (D1, 91) i guess(not sure)???. So it may be some time pass. Hope I will survive the journey some-how ??