EMD SD80MAC

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**EMD SD80MAC**
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Model	SD80MAC
Total production	30
AAR wheel arr.	C-C
Gauge	4 ft 8½ in (1435 mm)
Prime mover	EMD 20-710G3B-EC
Cylinders	20
Power output	5,000 hp (3.7 MW)
Career	Conrail, Norfolk Southern, CSX Transportation
Number	NS 7200-7216, CSX 800-812
Disposition	all still in service as of 2007

The SD80MAC is a 5000 horsepower (3.7 MW) C-C diesel-electric locomotive. The SD80MAC uses a 20 cylinder version of EMD's 710G engine, and is the first diesel locomotive to utilize a 20 cylinder engine since the SD45/ SD45-2. The SD80MAC introduced a wide radiator housing similar to GE locomotives and the placement of dynamic brakes at the rear of the locomotive, features that were incorporated into the SD90MAC and SD70ACe models. Key spotting difference between the SD80MAC and SD90MAC include: no external rear sandbox on the 90MAC, rear number boards, and the placement of the front numberboards (above the cab windows on the SD80MAC, on the nose on most SD90MACs). The SD80MAC also has recessed red marker lights in the nose, an identifying feature unique to Conrail locomotives.

All 30 units built were delivered to Conrail, and the 28 production units were completed, tested, and painted at the former Pennsylvania Railroad shops in Altoona, Pennsylvania. In the Conrail split, Norfolk Southern received 17 units (numbered 7200-7216) while CSX got 13 (800-812). The former Conrail units are the only AC traction locomotives owned by Norfolk Southern.

Chicago and North Western Railway ordered 15, along with Canadian Pacific, but the orders were canceled and/or changed. Even Conrail ordered more, but its new owners changed the order to SD70s and SD70MACs, all of which would be built at the Juniata Shop in Altoona.