The Krauss-Maffei ML 4000 is a road switcher diesel-hydraulic locomotive, built between 1961 and 1969 by German manufacturer Krauss-Maffei in Munich, Germany. It generated 3,540 horsepower from two Maybach V16 engines. 37 examples were built for two North American railroads and one South American railroad.
| Horsepower | Wheel Arrangement | Gearing | Weight | Tractive Effort | DRGW Class | Builder |
| 4000 | C-C | . | 330327 | 104080 | DE C-C 104 | Krauss-Maffei |
| Final Road # | Builder # | Purchased | Retired | Notes |
| 4001 | 18697 | 6/1961 | 2/6/1964 | To Southern Pacific #9021 Renumbered 9103, 11/1965 Retired 12/31/1967, scrapped |
| 4002 | 18698 | 6/1961 | 2/6/1964 | To Southern Pacific #9022 Renumbered 9104, 11/1965 Retired 12/31/1967, scrapped |
| 4003 | 18699 | 6/1961 | 2/6/1964 | To Southern Pacific #9023 Renumbered 9105, 11/1965 Retired 12/31/1967, scrapped |
