I only observe the Northeast Corridor through social media and railfan publications, so I am cautious about believing everything that is said. However, it it apparent that the availability of the Amtrak HHP8 electric locomotives was unsatisfactory.
When digging around to shed light on what was the reliability problem, things are somewhat vague. The only specific items I could find were (1) "the microprocessors" (itself being vague) initially not reacting well to extreme temperature changes. That says something, but not much. The other item was the wheel slip system being inefficient, particularly during falling leaf season.
Is there a Forumite who has access to any Amtrak availability numbers for its locomotive fleet?