On a train, a hot box is a failure of a bearing on an axle, resulting in heat, often smoke, and sometimes fire. If it's not caught in time, it ends up with the axle failing from the heat, resulting in a train derailment. It's a "stop this train sooner than immediately" kind of problem.
It's not the kind of thing that people do to a train.
It's not the kind of thing that people do to a train.