Great video, Rob. You didn't happen to catch the Hershey shifter from the past few days, did you?
NS is rebuilding their SD50 fleet, reclassifying them as SD40E's with a 3,000 HP rating and placing them into Altoona helper service, displacing SD40-2's into other service around the system.
An Eastbound NS 502 coaldrag is seen at Cassandra, Pa...with a 4 pack of former SD50's shoving hard on the rear.
http://www.youtube.com/watch?v=YWLHTi_dWQc