ABOUT THE PROTOTYPE

The SD70ACe is the successor of the SD70MAC, with changes being made to comply with emission standards. Going into production in 2004, the ACe fires with a 15% lower internal pressure to improve emissions. The ACe is equipped with EMD’s 16-710-G3C-T3 prime mover which is rated at 4300hp. Later, a Tier 3 version of this prime mover were rated at 4500hp. In 2015, the Tier 4 emission restrictions went into place, forcing EMD to develop the SD70ACe-T4 due to not being able to successfully modify the prime movers to be Tier 4 compliant.

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Heritage Units

The SD70ACe is a popular choice for Class 1 railroad heritage units. In 2012, Norfolk Southern took 10 of their SD70ACes for their heritage unit program, with the representatives being

• Savannah and Atlanta (1065)
• New York Central (1066)
• Reading (1067)
• Erie (1068)
• Virginian (1069)
• Wabash (1070)
• Central Railroad of New Jersey (1071)
• Illinois Terminal (1072)
• Penn Central (1073)
• Lackawanna (1074)

Starting at the end of 2025, NS has added the “Landmark” series of heritage units, calling attention to “Landmark” locations on their system with significant rail history. Two SD70ACes “Birmingham” (1230) and “Atlanta” (1231) along with two ES44ACs “Chicago” (8183) and “Altoona” (8184), have entered regular and executive service so far.

Union Pacific also chose the SD70ACe to be the engine for their heritage units.

• Missouri Pacific (1982)
• Western Pacific (1983)
• MKT (1988)
• Denver and Rio Grande (1989)
• Chicago & North Western (1995)
• Southern Pacific (1996)
• Employee Pride (1111)
• George H.W. Bush (4141)
• Spirit of the UP (1943)