No Sri S.K.Jain. Last month I was at Tirupathi Station for boarding the Kerala express to cbe. I reached the station more than one hour in advance and enquired in the enquiry counter and also a railway staff on the platform, what will be the coach position of B3. They replied that as Kerala express has more number of rakes, some times the AC coaches will be in the front and sometimes in the rear and informed that a public announcement would be made before arrival of the train and also the coach position display boards would also be switched on.