I have seen a few rent a wrecks more then once traveling the rails in NY ATGX was one that used to show up all the time here. I rember there BN Color C30-7's departing Buffalo on there way to Selkirk only to be turned back to Buffalo with in 24 hours then get turned back again to Selkirk you would see the same loco 2 sometimes 4 times in one week they only had something like 60 locos on there fleet at the time I was seeing them.
Last Sunday I spotted the EX BC Rail SD40-2 relettered for HLCX in Syracuse, NY which I had taken pics of 2 years befor in Weedsport, NY.
As an ironic twist 5 years ago I had taken photos of one of them expariamental energy conserving White face Burnington Northern SD40-2's in Savannah, NY 2 weeks ago I saw the same unit with only its name painted out with HLCX on the sides. The number was the same and the I rembered the Graffiti mark on the engineers side of the short hood was anouther dead give away.