Fetching details from the dictionary...
first-class carriage (coach)
一等車の座席は広くて快適だった。
The seats in the first-class carriage were spacious and comfortable.
追加料金を払って一等車に乗った。
I paid an extra fare and rode in first class.
一等車には専用のラウンジがあった。
The first-class carriage had a dedicated lounge.