The Atchison, Topeka and Santa Fe Railway (ATSF) had previously, performed a similar upgrade in its own Cleburne, Texas shops, stripping the locomotives down to bare metal and rebuilding with new equipment. The 567D3 engines were upgraded to a 2500-horsepower rating by the use of 645-series power assemblies. The generators and traction motors were upgraded and control and electrical equipment was replaced. The trucks received Hyatt roller bearings and single-clasp brake systems. Rooftop air conditioners and new horns were added. The locomotives were repainted in the blue and yellow "Yellowbonnet" scheme, and designated GP30u (for "upgraded"). 78 of these survived until the BNSF merger, and were eventually all sold off. In 2016, BNSF traded Larry's Truck and Electric (LTEX) 26 GP38s for 24 of the Ex-ATSF GP30u's for their GP39-3 rebuild program. The Reading Blue Mountain and Northern Railroad acquired a total of 6 of the former BNSF/ATSF GP30u's from LTEX and designates them as GP39RN locomotives.