My couple of comments:
Do I think the NTSB conclusion that a of lack of situational awareness was the probable cause of the accident? Yes, I do. In fact,
I thought so the day after the accident. I transposed the curve mileposts in that post on May 13, 2015, but that is what I thought the day after the accident, and the evidence obtained in the NTSB investigation increased my confidence that Mr. Bostian simply lost track of where he was on the railroad. The evidence suggests that Mr. Bostian came out of the right-hand curve at Second Street, thought he had just cleared the second Frankford Junction curve (also right-hand) and was entering 110mph territory. Every throttle and braking action of the train up to the accident was that of a train under full engineer control. The SEPTA incident was 4-1/2 miles west of the accident site. Nothing in the 4-1/2 miles traveled after passing the disabled SEPTA train suggested incapacitation. He accelerated to increasing track speeds, and slowed for lower track speeds. Even the acceleration to 106mph, with first full power, then reduced power as he approached what he may have thought was his 110mph target speed, was a normal, controlled acceleration to track speed - tragically the wrong track speed.
It there anything even remotely approaching a crime here? Not in my opinion. The NTSB found the lack of situational awareness to be the "probable cause" of the accident, meaning the act or acts most likely to have cause the accident as compared to other possible causes. A crime requires proof beyond a reasonable doubt - a much higher standard of proof than just "probable," and to be a crime, they also must show intent - essentially that Mr. Bostian knew he was unsure of his location and proceeded to go 106mph anyway. Exactly how is any prosecutor going to prove that beyond a reasonable doubt with the evidence in-hand? This is a political and PR prosecution. Oddly the Philadelphia District Attorney's office, with the DA presently under federal indictment for corruption, made the right call when they declined to prosecute due to a lack of evidence of a crime. It was the state Attorney General that reversed that call, and then double-downed by adding a felony charge. If there is any evidence of a crime, much less a felony, I sure can't see it.
A so-far unmentioned aspect of this criminal charge is the effect it could have on the NTSB's ability to investigate accidents. The NTSB needs those involved in accidents to be willing and candid in describing what happened. Here is a case where Mr. Bostian testified before the NTSB, and his testimony combined with the conclusions reached by the NTSB is now being used a basis for criminal charges against him - charges that are an extreme stretch at best. Were I an attorney (I'm not) and representing anyone involved in a transportation accident, I would look at what happened to Mr. Bostian and advise my client to not say one word to anyone unless granted full immunity from prosecution no matter how innocent they may appear. If the NTSB wanted my client to help them, but with the possible consequence that he or she might later be charged with a crime by some over-reaching prosecutor playing to the public and media, I'd tell them to go pound sand. I suspect the NTSB is thinking the exact same thing and is not happy about this at all.