Sitting outside of BNSF's house in Denver, this unit is one of only four like it ever built. When first developing AC traction motors, EMD used four SD60M's as prototypes, creating the only SD60MACs ever created. The units were delivered to Burlington Northern as BN 9500 to BN 9503. The units were ultimately returned to EMD and are typically found at the testing facility outside Pueblo. Here, EMDX 9501 is headed north toward the Seattle area for unknown reasons.
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