Hot box

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Hot box

Hot box , Hot-box
A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. The term is derived from the journal-bearing trucks used before the mid 20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called packing) to reduce the friction of the axle against the truck frame. When the oil leaked or dried out, the bearings overheated often starting a fire that could destroy the entire railroad car if not detected early enough.
This image belongs to the following categories: Rail transport terminology.

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