All I know is that in this day and age there is no excuse fro them not knowing they have sparks flying as an axle is grinding down to it snapping point. There are wireless cameras, Temp sensors, audio sensors monitored by computer, and the like that should be part of the system. Especially when they are carrying such toxic chemicals as these. Many Many people will die an early death from this.
Railroads are not known to adopt new technology very quickly.
As recently as 2013, Norfolk Southern had a RR crossing on a fairly busy road with no remote monitoring or telemetry whatsoever.
Wouldn’t be one bit surprised if it were still that way, and because remote monitoring and telemetry would make them aware of problems and ignorance is bliss (and a good legal defense, apparently).