This loco was built in 10/1968 with EMD serial number 34343. She was built as a freight roadswitcher, model GP40.

She became CR 3166 at the formation of Conrail.

She was leased by the Rio Grande on 11/08/1983 and given temporary number D&RGW 3166, as her PC/CR number would have conflicted with newly-delivered D&RGW GP40-2's.

She was acquired outright on 03/18/1985 and given her permanent number D&RGW 3151. She was not equipped with gyralights in service for the PC/CR and they were never retrofitted during her service for the Rio Grande.

D&RGW 3151:

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