boxcar

A boxcar is a fully enclosed railway freight car with a rectangular cargo body, designed to protect goods from weather and pilferage during transit. In North America, boxcars have been the standard general-purpose freight wagon since the late 19th century. The typical boxcar measures roughly 40 to 60 feet in length, 9 to 10 feet wide, and 10 to 12 feet high inside, with load capacities ranging from 70 to 90 tons depending on construction and age.

The defining feature is the large sliding door on one or both sides, which allows workers to load and unload cargo by hand or with small equipment. Steel construction on modern cars provides durability, though older wooden boxcars with steel underframes remain in service on some lines. The floor is typically wood planking, sometimes treated or metal-lined to resist rotting and chemical damage. Ventilation grilles or open slats may be built into the upper portions of the walls to allow air circulation for certain commodities.

Boxcars haul an enormous range of products: grain, fertilizer, machinery, textiles, packaged goods, and anything else that fits in the opening and tolerates rail transport. A grain shipper might load from above through the roof hatch or a top opening, while a manufacturing facility might use platform equipment to load pallets through the side door. The versatility made boxcars indispensable to general freight operations, though their share of rail traffic has declined since the 1970s as containerisation and specialised cars captured high-volume traffic.

Damage modes are predictable. Rotting of wooden floors and side planking shortens service life. Sliding doors stick or come off track, especially when rough-handled during switching. Rust develops in the roof and around doors in wet climates. The high tare weight of a loaded boxcar, compared to the same cargo in a container or hopper car, makes them inefficient for many modern supply chains. Many older boxcars were retired or sit in storage yards where they are occasionally rehabbed for shortline and heritage railway use.

The term boxcar is vernacular North American English; European railways use covered wagon or national equivalents. The name simply describes the shape: a box mounted on a rail chassis. American railroads classify them by reporting marks and internal dimensions, and the industry standard for many decades has been the 40-foot general-purpose boxcar, though 50-foot and 60-foot variants became more common from the 1960s onward.