GP7s 523 and 506 at Oklahoma City, OK (date unknown).

Location is Oklahoma City diesel shop tracks. If I remember correctly 523 is on the sand track, track 13, and 506 is on track 12. Both units are facing west.

Special thanks to Jerome Lutzenberger.

GP7 506 (date unknown). The picture is believed to have been taken at Fort Smith, Arkansas. The white flags indicate that the train is a work special.