GE U18B
The GE U18B diesel-electric locomotive was introduced by GE Transportation as a branch line roadswitcher in 1973. It was the only North American locomotive powered by the 8-cylinder 7FDL engine.
Original Owners
| Railroad | Quantity | Numbers | Notes |
| Maine Central Railroad | 10 | 400–409 | Blomberg trucks |
| Ferrocarriles Nacionales de México | 45 | 9000–9044 | AAR type-B trucks |
| Providence and Worcester Railroad | 1 | 1801 | FB-2 trucks |
| Seaboard Coast Line Railroad | 105 | 250–261, 300–392 | 325-392 with Blomberg trucks, all others FB-2 |
| Texas Utilities | 2 | 101–102 | AAR type-B trucks |