Last updated: 1 November 1997 Maintained with the assistance of Matthew Frahm Numbers Number Model Notes 544-546,548- 15 SD10 551,553-560 1463,1471,1483, 4 GP9 1484 3800-3803 4 GP38 to become GP38Q 3830-3835 6 GP38-3 rebuilt from GP40 4000-4006 7 GP40/40Q all to be upgraded to GP40Q 6050-6055 6 SD40-3 6056 1 SD40 to become SD40Q 6057-6061 5 SD40 to become SD40Q 6359-6370 12 SD40-2 6601,6602,6605, 11 SD9 6609-6612,6614, 6615,6617,6620