GP38-2 400 Tulsa, OK in February 1980.
Location is Tulsa, Oklahoma.

The locomotives are in the Mechanical Department’s service tracks area at Cherokee Yard. The yellow sand gantry crane is at its southern most location. It ran north and south on dedicated track above a pair of service tracks. There was an elevated work platform station that could transverse east to west over the service tracks. The platform could elevate up and down to reach different heights of locomotive sand box fill caps.

The fixed square fill tower is at the south end. Above the gantry is the gray fill point to replenish the gantry’s sand hopper. Sand is pneumatically pumped from the sand storage tower, through pipes, up to the fill tower and into the gantry crane. When needed the gantry moved into position along the service tracks to replenish individual locomotive sand boxes. Sand is used in locomotives to improve traction and braking efforts between the steel wheels on steel track.

Note the Santa Fe locomotive on the adjacent track at the left edge of this photo.

View is looking northeast.

Thanks to Mark Davidson for the detail.