 The 1978–79 Conrail GP9 rebuilding program by Paducah was engine and electrical gear only with no carbody modification (the high short hoods were kept).The Precision National Corporation Shops at Mount Vernon, Illinois rebuilt six Conrail GP9s to GP10s in 1978.The Morrison-Knudsen Boise Shops rebuilt 17 Conrail GP9s to GP10s in 1978–1979.