description EMD SD70ACe Overview
The EMD SD70ACe is a modern six-axle diesel-electric locomotive manufactured by General Motors Diesel (EMD). Introduced in 2004, it represents a significant advancement in freight locomotive technology. Notably, the SD70ACe meets stringent EPA Tier 2 emissions standards and offers enhanced performance for North American Class I railroads involved in heavy hauling operations. It is primarily utilized by rail operators requiring powerful and efficient locomotives for long-distance freight transport.
help EMD SD70ACe FAQ
What does ACe mean in the SD70ACe name?
The AC identifies alternating-current traction motors, while the model belongs to EMD's SD70 family. A standard SD70ACe uses six powered axles and produces about 4,300 horsepower.
How is the SD70ACe different from the SD70M-2?
The SD70ACe uses AC traction motors, whereas the closely related SD70M-2 uses DC traction. AC traction is particularly useful when starting heavy freight trains or maintaining adhesion at low speed.
Which railroads are known for operating SD70ACe locomotives?
Union Pacific and BNSF have operated large fleets, while Kansas City Southern became strongly associated with the model's distinctive cab profile. Variants were also exported to railways in countries including Australia and Mexico.
What are Union Pacific's SD70ACe heritage units?
Union Pacific painted several SD70ACes to honor predecessor railroads such as Missouri Pacific, Western Pacific and Southern Pacific. No. 1989, for example, carries a Rio Grande-inspired scheme.
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