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.’
- ‘The infamous hot box detector at Springer caught us and resulted in a half hour delay, which killed most of the time we made up.’
2another term for sweatbox