Starting in 1997, Union Pacific took delivery of 21 SD90MACs with 4-cylinder, 6000 HP prime movers. Roughly a decade later finds 20 of these 21 units in storage, not being used. The 21st unit has been returned to EMD for testing purposes. One of the 20 units in storage, UP 8923 (ex-UP 8513) is seen at Burnham in Denver.
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All twenty of the SD90MACs (with a true 6000 HP prime mover) that UP still has on its roster were in storage at Burnham - in one long line - at the end of 2007. Who knows if these units will ever be reactivated, or if they perished soon after the inception, similar to the U50 about thirty years ago.
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