1(In a railroad vehicle) an overheated axle box or journal box.
- Things they would watch for included smoke or fire from a hot box (wheel journal), shifted loads, and dragging equipment, evidenced by signs of freshly damaged ties etc. as seen from a rearward look.
- At 6: 09 PM, I heard a defect detector at milepost 165.1 say that it found a hot box.
- A hot box detector went off about 10 miles from Alpine.
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Syllabification: hot box
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