
An observation car/carriage/coach (in US English, often abbreviated to simply observation or obs) is a type of railroad passenger car, generally operated in a passenger train as the last carriage, with windows on the rear of the car for passengers` viewing pleasure. The cars were nearly universally removed from service on American railroads begin....
Found on
http://en.wikipedia.org/wiki/Observation_car

• 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.
Found on
http://thinkexist.com/dictionary/meaning/observation_car/
Ob`ser·va'tion car 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.
Found on
http://www.encyclo.co.uk/webster/O/5
No exact match found.