Flatcar, 50 Foot Depressed Center (European)

History: A flatcar (US) (also flat car (US) or flat wagon (UIC)) is a piece of railroad (US) or railway (non-US) rolling stock that consists of an open, flat deck mounted on a pair of trucks (US) or bogies (UK), one at each end containing four or six wheels. Occasionally, flat cars designed to carry extra heavy or extra large loads are mounted on a pair (or rarely, more) of bogeys under each end . The deck of the car can be wood or steel, and the sides of the deck can include pockets for stakes or tie-down points to secure loads. Flatcars designed for carrying machinery have sliding chain assemblies recessed in the deck.

Depressed center flat cars are of a special construction having the portion of floor extending between trucks depressed to provide necessary overhead clearance for lading. When large and heavy loads need to be moved long distances railroads are often the best choice for the job. These loads are often tall enough that they wouldn't pass safely under bridges or other obstacles if carried on conventional flat cars. To provide extra clearance, railroads use heavy-duty, depressed center flat cars. The lower center deck provides several inches of extra clearance, and since the cargo does not have to be lifted as high, loading and unloading is easier.

From Wikipedia

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