Weighing in at more than 400,000 pounds and with a length in excess of 80 feet and massive 5,000 horsepower tractive effort, the SD80MAC is one of the heaviest, longest, and most powerful single diesel locomotives in the world. Originally purchased by Conrail, the locomotives were divided up between CSX and Norfolk Southern when the railroad dissolved. The locomotives which are still in service today now wear the “unibrow” paint scheme along with the NS Horsehead logo – distinguishable from the previous versions as they substitute the full white face for a strip of white surrounding the number boards above the cab.