observation car
noun🔊/ˌɒbzəˈveɪʃn kɑː(r)/
🔊/ˌɑːbzərˈveɪʃn kɑːr/
(especially North American English)a coach on a train with large windows, designed to give passengers a good view of the passing landscape 观光车厢，游览车厢（火车车厢，有大窗）