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														Monday, March 7, 2016
													
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														Kevin Morgan
													
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														Blue Mountain Drive (MP 22.43)
														
														 Arvada, CO
														
													
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														1380  (Add a Comment)
														
													
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														Moffat Tunnel (UP)
													
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														Union Pacific, Electro-Motive Division
													
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																				An SD70AH leads what you might consider its children on at Blue Mountain. The colorful units trailing are SD70ACe-T4s, and they are prototypes for EMD's Tier-4 compliant engines. The prime movers are a departure from previous EMD models. The 2-stroke, 710-engine has been a staple of EMD for a couple of decades now. In order to reach emissions standards, however, these new units are 4-stroke, 1010-engines. They only have 12 cylinders instead of the traditional 16, but they still pump out 4,400 horsepower.
																			
																			 
																			
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