This is the latest engine that is offered by General Electric. It is the ET44AH and it was first put in to production about six years ago. It is compliant with Tier-4 emissions standards. The Tier-4 units are more complex and, in general, have required more maintenance than Tier-3 (and older) units. Consequently, Tier-4 units from both GE and EMD have not been particularly big sellers. UP has 170 of these ET44AHs on the roster.
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