Phil - that would make them part of the 3rd Run. I am surprised as it shares the same chassis with the E8, E6, & E5s of which have not had known serious issues.
The "Train of Tomorrow" that Charlie mentions could be considered a run 2.5. It shares a little more in common with the 2nd run than the 3rd.
Yet another reason to get a test track set up and check my PRR ones out and report back. As I have mention my 3 rail E8s, E6s and E5 run flawlessly. Haven't run the two rail E8 yet which should be identical to the current E7 in terms of engineering.