EMD SW1 | EMD | EMD SW1200 | EMD GP40-2 | EMD SW900 | EMD G16 | EMD F3 | EMD 710 | EMD 567 | EMD SD9 | EMD SD70 series | EMD GP7 | EMD GP40 | EMD GP38 | EMD F-unit | EMD FT | EMD FP7 | EMD FP45 | EMD E5 |
Some early Proto examples such as the EMD BL2, GP18, GP20, GP9, SD9 and Alco FA-2 were plagued with Chinese-made axle gears that would crack, causing the unit to run erratically or with loud "thumping" sounds.