関連ワード:  which berth is best in 3ac    which berth is best in 3ac train    which berth is best in 3ac coach    which seat is best in 3ac train    which seat is best in 3ac    which berth is best in 2ac    how many berth in 3rd ac    how many berths are there in ac 3 tier    berth position in 3 tier ac