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Entry 1 sense Webster, 1913

Observation car

· Ob·ser·va·tion car · IPA
01 A railway passenger car made so as to facilitate seeing the scenery en route; a car open, or with glass sides, or with a kind of open balco…
  1. 1.
    A railway passenger car made so as to facilitate seeing the scenery en route; a car open, or with glass sides, or with a kind of open balcony at the rear.