SOuth India, Dude, The most I have seen In North where people just come and throw our bags and sit.. Once in a train i caught from LHU to DEE, I kept ma bag which had ma laptop in it on ma seat and went to buy water.. and when i came my bag was missing and on ma seat another guy sitting.. on asking he said there is no reservation in these trains and he dint find ma bag.. upon asking ma co pax, he told me the bag he kept under the seat and he sat in ma seat... Rest of the journey from Rewari to DEE, i had to adjust with ma co pax...