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 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 window recessed behind the expanded observation platform, which was fenced with opulent railing supporting an (optional) illuminated drumhead at the B end. Fresh drinking water, grey water, kerosene/fuel and other tanks crowded beneath the floor sill competed for space with heating/cooling, axle powered mechanical equipment, shore power batteries and equipment/tool storage bins to support a self-sustaining/self-reliant car whether on the road or on a siding while making track orders. This variety of features is easy to spot with a variety of window placement and sizes, while Observation Car windows tend to be more uniform in size and placement.
Among North American railroads, their observation cars often featured any of a variety of upcharge revenue seating, reserved sitting/drawing rooms or sleeper roomettes in the forward section, in the form of reclining coach seats, plush parlor car chairs near side tables or bedrooms and the occasional crew dormitory, such configurations varying greatly between railroads. A lighted drumhead adornment, usually indicating the name of the train or the name/logo of the railroad would invariably (except on the Milwaukee Road, see below) be hung from the tail end of the observation car. Some early trains offered two observation cars: a traditional enclosed type for its compartment or "first class" passengers and an open type resembling a flat car for its tourist class riders.
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