Very nice James!
After more than 2 years, I finally saw the Erie Heritage Unit. I've seen 18 of the 20 HU's and photographed many of them, missing only the Erie and the N&W. The Erie came up the old Reading Lurgan Line in the wee hours yesterday, and I was able to find it at lunchtime at the Enola engine facility.

19 down, one to go...
Ron