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A prisoner transport vehicle, informally known as a "Sweat Box" or “Court Bus” amongst British prisoners, is a specially designed or retrofitted vehicle, usually a van or bus, used to transport prisoners from one secure area, such as a prison or courthouse, to another. Less commonly, aircraft, railcars or vessels are also similarly fitted. These vehicles must be highly protected and may feature bars or wire mesh over the windows, bulletproof glass, segregated prisoner compartments, and additional seating for escorting officers.