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 rearmost carriage, with windows or a platform on the rear of the car for passengers' viewing pleasure. The cars were nearly universally removed from service on American railroads beginning in the 1950s as a cost-cutting measure in order to eliminate the need to "turn" the trains when operating out of stub-end terminals. The push-pull mode of operation removes this limitation. In Europe, various trains are now fitted with observation cars at either or both ends. Configuration The main spotting feature of observation cars is at the "B" end (tail) of the car; the walls of lightweight and streamlined cars usually round together to form a tapered U shape, smoothly or with a door, and larger panoramic windows were installed all around the end of the car. On older heavyweight cars, the rear end of the car consisted of an enlarged, canopied porch-like open vestibule platform area, with the door and enlarged windows set back into the car, giving wind-wing shelter from the draft. Whether old or new there was frequently a large open lounge in the B end where passengers could enjoy the view as they watched the track recede into the distance, and usually (but not always) equipped as a club car with a bar or buffet where soft drinks, cocktails and snacks could be purchased. This differs from non-revenue business cars or private varnish, which may have featured (starting with the A end;) the normally locked center communicating door to a corridor along one side, leading to the salon with doors to a pantry and small galley which was often convertible to a dormitory for the chef and porter/steward at night with cutting board covering a sink, a combination oven/stove/hot-water-tank/steam-heating-boiler and diminished side door for loading supplies, then a private restroom/bathing-room, one or two deluxe private rooms for a personal secretary perhaps and the line's vice president, a locked china/silver/liquor cabinet along the final dividing wall facing a large open multipurpose salon. The salon was often fitted with fold down overhead bunks above a retractable dining/conference table over sub-deck storage, a conductor's desk with secured storage for train log, wine log, and merchant's account books along with relevant gauges such as air pressure and speedometer at the track inspection viewing