The bona fide passengers of 12842 Coromandel Express & 12515 Tiruvananthapuram-Guwahati Express had a nightmarish experience travelling on these trains. On Monday 10th October, 2011 the passengers having valid reservation for reserved coaches in these two trains had a horrid time getting on these trains as the coaches had already been occupied by passengers travelling without reservation. The incident happened at Visakhapatnam station. The bona fide passengers had to get in through the windows as those inside refused to open the gates. Inside the compartments the situation was no better. As the seats had already been occupied by unauthorized passengers, the passengers having valid reservation had a nightmarish experience. There was problem of drinking water. I really really feel sorry for these passengers who in spite of having valid reservation had to spend nightmare of a night inside reserved compartments.