This loco was built in 9/1968 with EMD serial number 34330. She was built as a freight roadswitcher, model GP40.

She became CR 3153 at the formation of Conrail.

She was leased by the Rio Grande on 11/01/1983 and given temporary number D&RGW 3153, as her PC/CR number would have conflicted with newly-delivered D&RGW GP40-2's.

She was acquired outright on 03/16/1984 and given her permanent number D&RGW 3142. She was not equipped with gyralights in service for the PC/CR and they were never retrofitted during her service for the Rio Grande.

Note that she was the first unit to wear the number D&RGW 3153 (as a temporary lease number.) The second unit to wear that number (as a permanent number) was originally PC/CR 3169 and then D&RGW 3169.

D&RGW 3142:

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