Hokie72- On the 12 of Augest, We were at the Enola yard also, River Road at the north side of the yard is really an excellent spot to see trains being built and running through or into the yard. Did you happen to see NS 4001 and NS 1036 at Altoona? (Two locos wrecked at Mattawanna PA last april)
Here are the photos from Northumberland and Harrisburg/Enola Yards.