Part of my work involves healthcare patient safety -- principles learned from aircraft, nuclear power, oil & gas, safety, etc. What I found notable was that tw

Part of my work involves healthcare patient safety -- principles learned from aircraft, nuclear power, oil & gas, safety, etc. What I found notable was that two months (March vs. May) prior to the accident, the "optimal" break time for train engineers between runs was reduced to 90 mins from about 2.5 hours. The union had protested this change, but to no avail. If the train the engineer had come in late for any reason, the break could be less than 90 minutes. In my view, it was certainly unwise to have made this shortening of break time for engineers before the completion of PTC on the line (it at all).