Pasenger Train by US 322?

Yesterday (9/30) While I was driving on US 322 by Dauphin, PA, I happened to catch a unique train. It had 2 PRR F units, and (6-7?) passenger cars in the Tuscan Red paint scheme, but with NS lettering. What is this? Corporate train? Tour? Please help me, as I am clueless.

See http://www.trainorders.com/discussion/read.php?2,1008769,1008991

This trip was operated for the Lexington Group in Transportation History.