About five years ago, BNSF experimented with a rebuild program in association with Progress Rail. A total of 24 SD70MACs were give brand new electronics and traction motors. Their designation was changed from "SD70MAC" to "SD70MACe". Not sure the reasoning, but it appears those 24 units were the only ones to go through the program. BNSF 9730 is one of the two dozen units to receive the rebuild (and a fresh coat of paint, going from the Heritage 2 scheme to the New Image scheme).
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