| GE U18B | |
| Powertype: | Diesel-electric |
| Builder: | General Electric |
| Buildmodel: | U18B |
| Builddate: | March 1973 - October 1976 |
| Totalproduction: | 163 |
| Aarwheels: | B-B |
| Uicclass: | Bo′Bo′ |
| Length: | 54feet |
| Primemover: | GE 7FDL |
| Enginetype: | V8 4-stroke diesel |
| Aspiration: | Turbocharger |
| Displacement: | 5344cuin |
| Cylindercount: | 8 |
| Cylindersize: | 9x |
| Transmission: | DC generator, DC traction motors |
| Poweroutput: | 18002NaN2 |
| Locobrakes: | Straight air, Dynamic |
| Trainbrakes: | 26-L Air |
| Locale: | North America |
The GE U18B diesel-electric locomotive was introduced by GE Transportation as a branch line road switcher locomotive in 1973. It was the only North American locomotive powered by the 8-cylinder 7FDL engine.[1] The U18B was not a popular seller with GE only making about 150 of them, and they were mostly purchased by Maine Central and Seaboard Coast Line. Railroads lost interest in specialized road units entering the 1970s. The U18Bs were noted for having reliability issues and being underpowered.[2] The Maine Central referred to their U18Bs as the Independence class and named their units after revolutionary war heroes.[3] GE included information about a B18-7 locomotive (which would have followed the U18B) in its 1978 "Series-7 Road Locomotives" service manual, but none of these updated units were ordered, sold, or built.[4]
| Image | Railroad | Quantity | Numbers | Notes |
|---|---|---|---|---|
| Maine Central Railroad[5] | 10 | 400–409 | Blomberg trucks; part of a cancelled SCL order | |
| 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. All to CSX. 10 additional units on order but cancelled | |
| Texas Utilities | 2 | 101–102 | AAR type-B trucks | |