List of MLW diesel locomotives 4-axle units 4-axle units

| Model | Build_date | Total_produced | Wheel_arrangement | Prime_mover | Power_output |
|---|---|---|---|---|---|
| C-424 | 1963–1967 | 92 | B-B | 16-251B | hp (kW) |
| M-420 | 1973–1977 | 92 | B-B | 12-251C | hp (kW) |
| M-420B | 1975 | 8 | B-B | 12-251C | hp (kW) |
| M-420R | 1974–1975 | 5 | B-B | 12-251C | hp (kW) |
| M-420TR | 1972 | 2 | B-B | 12-251C | hp (kW) |
| M-420TR | 1975 | 15 | B-B | 12-251C | hp (kW) |
| M-424 | 1980 | 19 | B-B | 16-251B | hp (kW) |