ob·ser·va·tion 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）