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EMD SD80 Series
Conrail SD80MAC 4100.jpg
Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Electro-Motive Division(EMD)
ModelSD80MAC, SD80ACe
Build date1995–1996 (SD80MAC), 2011– (SD80ACe)
Total produced30 (SD80MAC) + 7 (SD80ACe)
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter45 in (1,143 mm)
Length80 ft 2 in (24.43 m)(80MAC)
76 ft 6 in (23.32 m)(80ACe)
Height15 ft 5 in (4.70 m)(80MAC)
15 ft 10 in (4.83 m)(80ACe)
Loco weight420,000 lb (191,000 kg)(80MAC)
432,500 lb (196,000 kg)(80ACe)
Fuel capacity5,800 US gal (22,000 l; 4,800 imp gal)(80MAC)
4,900 US gal (19,000 l; 4,100 imp gal)(80ACe)
Prime moverEMD 20-710G3B-ES(80MAC)
EMD 20-710G3C-ES(80ACe)
Engine typeV20 diesel
Transmissiondiesel electric
Performance figures
Maximum speed75 mph (121 km/h)
Power output5,000 hp (3.7 MW)(80MAC)
5,300 hp (4.0 MW)(80ACe)
Tractive effortStarting (80MAC): 185,000 lbf (822.92 kN)
Continuous (80MAC): 147,000 lbf (653.89 kN)
Starting (80ACe): 191,000 lbf (849.61 kN)
OperatorsConrail, Norfolk Southern, CSX
ClassNS 7200–7228, Vale 101-107
DispositionAll but 1 still in service on Norfolk Southern

The SD80MAC is a 5,000 horsepower (3.7 MW) C-C roadswitcher 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. The other two units rostered by Conrail were EMD demonstrator units that were purchased outright[1] Many consider the SD80MAC to be the last new locomotive Conrail purchased as a truly independent railroad. In the split of Conrail, Norfolk Southern received 17 units (numbered 7200–7216) while CSX got 13 (800–812, being renumbered to 4590–4602). The former Conrail units were the first AC traction locomotives owned by Norfolk Southern, with the railroad not ordering more until late 2008 with an order of General Electric's ES44AC.

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.

Disposition of the original SD80MACs[edit]

In January 2014, CSX 4594, formerly CSX 804, and built as CR 4110, was scrapped after being used as a parts donor following a derailment in early 2009. This makes it the first (and only) SD80MAC to be scrapped.

In late 2014, Norfolk Southern announced that they had reached an agreement with CSX Transportation to trade 23 EMD SD40-2 units (NS 3425-3447) for CSX's remaining 12 SD80MACs, leaving NS as the model's sole operator. Norfolk Southern plans to use the 12 SD80s to supplement its existing fleet in unit train coal service. The trade was finalized in March, 2015 and NS instead traded 12 SD40-2 units (NS 3425-3427, 3430, 3432-3433, 3438-3440, 3443, 3446-3447) for the 12 SD80MACs owned by CSX. Norfolk Southern has numbered these units 7217-7228, which aligns these units with the existing SD80MACs on the NS system (numbered 7200-7216).

As of April 2015, Norfolk Southern has taken delivery of the 12 SD80MACs from CSX, uniting the fleet that had been broken up with the Conrail split. As of September 2015, all units acquired from CSX have been repainted into Norfolk Southern's standard 'Horse Head' paint scheme. Excluding unit 7222, all former CSX units have had mechanical repairs and/or repainting completed, and are in service.[2] As of August 2016, all 29 units have been repainted and are in service. Due to the increased number of units, they are no longer assigned to one area, and can be seen across parts of the NS system.

Norfolk Southern had removed the marker lights from the original 17 SD80MACs that they had acquired during the Conrail split. The CSX did not remove the marker lights from their 12 units. After the Norfolk Southern acquired the remaining SD80MACs from the CSX, they have removed the red marker lights from these locomotives as well.

In 2018, after the Norfolk Southern had finished rebuilding its SD90MAC fleet into SD70ACUs, it was slated to rebuild all 29 SD80MACs to SD80ACUs.

SD80MAC technical details[edit]

The technical details of this locomotive model are as follows:[3]

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
  • 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))


  • "SD80ACe Specification Sheet" (PDF). Progress Rail.
  • Electo-Motive Division of General Motors (1996). SD80MAC Operator's Manual 1st Edition February 1996. Electo-Motive Division of General Motors.
  • Myers, Lance (2005). "Conrail Cadillacs: The SD80MAC". SD80MAC.com. Retrieved December 2, 2005.
  1. ^ "Conrail Cadillacs: The SD80MAC". Railfan USA. Archived from the original on 29 September 2015.
  2. ^ Toth, Chris R. "EMD SD80MAC Nos. 7200-7228". NSDash9.com.
  3. ^ Siemens. "Diesel-Electric Locomotive SD80MAC with Three-Phase Drive" (PDF). Archived from the original (PDF) on 14 November 2004.