EMD SD80MAC

EMD SD80 Series
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division(EMD) Model SD80MAC, SD80ACe Build date 1995–1996 (SD80MAC), 2011– (SD80ACe) Total produced 30 (SD80MAC) + 7 (SD80ACe)
Specifications Configuration: ​  • AAR C-C  • UIC Co'Co' Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Trucks EMD HTCR II Wheel diameter 45 in (1,143 mm) Length 80 ft 2 in (24.43 m)(80MAC) 76 ft 6 in (23.32 m)(80ACe) Height 15 ft 5 in (4.70 m)(80MAC) 15 ft 10 in (4.83 m)(80ACe) Loco weight 420,000 lb (191,000 kg)(80MAC) 432,500 lb (196,000 kg)(80ACe) Fuel capacity 5,800 US gal (22,000 L; 4,800 imp gal)(80MAC) 4,900 US gal (19,000 L; 4,100 imp gal)(80ACe) Prime mover EMD 20-710G3B-ES(80MAC) EMD 20-710G3C-ES(80ACe) Engine type V20 diesel Cylinders 20 Transmission diesel electric
Performance figures Maximum speed 75 mph (121 km/h) Power output 5,000 hp (3.7 MW)(80MAC) 5,300 hp (4.0 MW)(80ACe) Tractive effort Starting (80MAC): 185,000 lbf (822.92 kN) Continuous (80MAC): 147,000 lbf (653.89 kN) Starting (80ACe): 191,000 lbf (849.61 kN)
Career Operators Conrail, Norfolk Southern, CSX Class NS 7200–7228, Vale 101-107 Disposition All but 1 still in service on Norfolk Southern, All units are currently in storage

The SD80MAC is a 5,000 horsepower (3.7 MW) C-C diesel-electric locomotive. The model uses a 20-cylinder version of EMD's 710G prime mover, and is the first diesel locomotive to use a 20-cylinder engine since EMD's SD45 and SD45-2. It introduced a wide radiator housing similar to GE Transportation locomotives and the placement of dynamic brakes at the rear of the locomotive, which is a quieter location, 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 SD90MAC, 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, although Norfolk Southern (NS) has removed the lights on most of their former Conrail engines.

All 30 SD80MAC 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.

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

In 2009, NS 7205, the final SD80MAC in Conrail's scheme, (formerly CR 4109) was repainted to Norfolk Southern's scheme. No SD80MACs remain in a Conrail color scheme.

Vale Mining of Brazil ordered a set of 7 updated locomotives designated as the SD80ACe model. These locomotives feature Tier 1 compliant 20-710G3C engines. The design is currently for export only, and these specific locomotives will run on Vale Mining's 5 ft 3 in (1,600 mm) broad gauge trackage.

In February 2020 Norfolk Southern sold all 29 of its remaining SD80MACs to Canadian Pacific Railway and Progress Rail. Six units, 7206, 7215, 7218, 7225, 7226 and 7227 were sold to Canadian Pacific Railway as a parts source for the recent SD70ACu rebuilds. The purge of the remainder of the NS fleet went to Progress Rail, this was due to the implementation of Precision Scheduled Railroading policies at Norfolk Southern.

SD80MAC technical details

The technical details of this locomotive model are as follows:

Prime mover

• Electro-Motive Diesel V-20 710G3B-ES
• Displacement: 14,200 cubic inches (233 L)
• Idle: 200 rpm
• Full speed: 904 rpm
• Lube oil capacity: 510 US gal (1,900 L; 420 imp gal)
• Cooling water capacity: 342 US gal (1,290 L; 285 imp gal)
• Fuel capacity: 5,800 US gal (22,000 L; 4,800 imp gal)

Main alternator

• Electro-Motive Diesel TA22-CA8A
• Maximum voltage: 2600 V DC
• Maximum current: 8100 A

Traction motors

• 6 Siemens 1TB2830 AC motors mounted 3 each on 2 HTCR-2 Radial Self Steering trucks.
• Rated output: 638 kW (856 hp)
• Gearing: 83:16
• Wheel size: 45 in (1,143 mm)
• Max revolutions: 3,435 rpm
• Starting torque: 16,300 N⋅m (12,000 lbf⋅ft)
• Continuous torque: 12,900 N⋅m (9,500 lbf⋅ft)
• Maximum voltage: 2,183 V

Performance

• Maximum speed: 75 mph (121 km/h)
• Starting tractive effort: 185,000 lbf (820 kN)
• Continuous tractive effort: 147,000 lbf (650 kN)
• Braking effort: 96,000 lbf (430 kN))
• Weight: 210 short tons (187.5 long tons; 190.5 t); 420,000 lb (190,500 kg))

References

• "EMD SD80ACe Specifications" (PDF). EMD and Progress Rail.
• Electo-Motive Division of General Motors (1996). SD80MAC Operator's Manual 1st Edition February 1996. Electo-Motive Division of General Motors.