i have booked two tickets in first AC for 16.3.11 on Tamil Nadu Express/12621, from vijayawada to delhi. both tickets are confirmed. i wanted to know whether it will be in one coupe where we can lock the door. whether other seats are also in coupe? we have a lab dog, which we want to travel with. whether it is possible in this situation?? this train is showing only three birth in 1AC up to last possible date of reservation from vijayawada station. what does it mean?? is is general cabin or coupe?? i mean to say what is the layout for this train in first AC??