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A hopper car (NAm) or hopper wagon (UIC) is a type of railroad freight car that has opening doors on the underside or on the sides to discharge its cargo. They are used to transport loose solid bulk commodities such as coal , ore , grain , and track ballast .
Prior to the invention of this type of coil car, coils of sheet metals were carried on-end or in cradles in open or covered gondolas. Load shifting, damage, and awkward loading and unloading were all problems, and since so much sheet metals are railroad-transported, a specialized car was designed for transporting coiled metals.
A railroad car, railcar (American and Canadian English), [a] railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is a vehicle used for the carrying of cargo or passengers on a rail transport network (a railroad/railway).
An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
By mid-century, under the leadership of Richard L. Duchossois, the company focused on building specialized freight cars, such as high-cube boxcars for auto parts, all-door boxcars for building products, gondolas, rotary-dump gondolas for coal, bulkhead flatcars and centerbeam flatcars for lumber, double-stack container cars, covered hoppers ...
A rail yard, railway yard, railroad yard (US) or simply yard, is a series of tracks in a rail network for storing, sorting, or loading and unloading rail vehicles and locomotives. Yards have many tracks in parallel for keeping rolling stock or unused locomotives stored off the main line , so that they do not obstruct the flow of traffic.
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In North America the term "railcar" has a much broader sense and can be used (as an abbreviated form of "railroad car") to refer to any item of hauled rolling-stock, whether passenger coaches or goods wagons (freight cars). [3] [4] [5] Self-powered railcars were once common in North America; see Doodlebug (rail car).
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