1) Journal bearing 2) Overheated railway housing 3) Railway car problem 
[baseball] Hotbox is a baseball drill or mini-game that can be played with three or more players and two to four bases. In the drill, one fielder plays near each of the bases and the rest of the players are runners, who begin on any base. The fielders proceed to throw the ball to each other, playing catch. At any time, a runner may attempt ...
An axle bearing that has become excessively hot due to friction.
[n] - a journal bearing (as of a railroad car) that has overheated
noun a journal bearing (as of a railroad car) that has overheated
a journal box overheated by excessive friction of an axle as a result of inadequate lubrication or the presence of foreign matter.