Everything that could have gone wrong ... did go wrong ... the big guys in charge of the track/signal planning for the Frankford Junction, never in their wildest dreams, ever expected an engineer to be going that fast, northbound on that curve, so they purposely denied ATC installation on the northbound tracks for over a decade, saying it was not even needed at that location
Whether the engineer was frazzled, due to late schedule, or equipment problems will all be ironed out ... it is a very demanding monotonous, hypnotizing job.
I can not think of a more boring, stressful job than driving a high speed train day in, and day out, especially when there was a 110 speed limit before Frankford junction, reducing to 80mph, then reducing further to 50mph in the actual curve, and there was no ATC to warn of this speed restriction, even though these speed restrictions were in effect in the Frankford Junction train crash on the PRR in 1943, and is well known to be a dangerous tight curve. The 1943 crash was blamed on a defective hotbox, and happened a couple tenths of a mile east of Frankford Junction curve at Frankford & Glenwood ave's, near Pacific street, on a relatively straight stretch of track preceding the curve
https://www.youtube.com/watch?v=D7mbFiIH6-Q