Fatigue is an old issue for railroading, and we see the outcome every so often when a major accident occurs. CN at Hinton, AB., comes to mind... while CN was a Crown Corporation. In many ways it's the nature of the job, though like all things, there is always a better way to manage crew utilization. It's somewhat interesting that the usual complaint is the crews being turned too quickly after a run, but in this case it seems they are being turned too slowly.
Blaming EHH for fatigue is scapegoating for an ill that has long haunted the industry. Given the narrow geographical context of the order, it would be prudent to posit there is more going on here, perhaps a local operating condition exacerbating the problem?