I happened to notice MTH had a nice write-up on their website in the description menu for the 44T about recording the sounds from the two REAL 44ts up at Walkersville Southern (I used to volunteer on the train crew).
The engine in the photos is the 44t that came from Strasburg. The description describes the 44t that came from South Carolina. Both are owned by Jamie. The Strasburg 44t is used occasionally on the passenger trains.