| ALCO RSD-4 | |
| Powertype: | Diesel-electric |
| Builder: | ALCO |
| Buildmodel: | RSD-4 (Specification E1663) |
| Builddate: | 1951–1952 |
| Totalproduction: | 36 |
| Aarwheels: | C-C |
| Trucks: | ALCO trimount |
| Wheeldiameter: | 40inches |
| Minimumcurve: | 21° (274.37abbr=onNaNabbr=on) |
| Wheelbase: | 42feet |
| Length: | 56inchesft6inchesin (ftin) |
| Width: | 10inchesftNaNinchesin (ftin) |
| Height: | 14inchesftNaNinchesin (ftin) |
| Locoweight: | 278860lb |
| Fuelcap: | 800usgal |
| Primemover: | ALCO 244 |
| Rpmrange: | 1000 (max) |
| Enginetype: | V12 Four-stroke engine diesel |
| Aspiration: | Turbocharger |
| Displacement: | 8016cuin |
| Generator: | GE 5GT-581A1 |
| Tractionmotors: | (6) GE 5GE752-C1 |
| Cylindercount: | 12 |
| Cylindersize: | 9x |
| Poweroutput: | 1600abbr=onNaNabbr=on |
| Tractiveeffort: | 69700lb |
The ALCO RSD-4 was a 1600hp six axle diesel-electric locomotive built by the American Locomotive Company between 1951 and 1952.[1] It was a derivative of the four-axle ALCO RS-3, with two additional powered axles which allowed better tractive effort at lower speeds. Due to the inadequate capacity of the main generator, this model was later superseded in production by the ALCO RSD-5.
| Railroad | Quantity | Road numbers | Notes |
|---|---|---|---|
| Atchison, Topeka and Santa Fe Railway | 10 | 2100–2109 | |
| Chicago and North Western Railway | 5 | 1515–1517, 1619–1620 | |
| Central Railroad of New Jersey | 14 | 1601–1614 | |
| Kennecott Copper Corporation | 1 | 201 | Preserved |
| Utah Railway | 6 | 300–305 | |
| Total | 36 | ||
The only ALCO RSD-4 that has survived is Kennecott Copper Corporation #201. It resided at the Northwest Railway Museum until November 2021 (formerly known as the Puget Sound & Snoqualmie Valley Railway) in Snoqualmie, Washington in its orange Kennecott paint scheme.[2] As of 2021, it has been returned to Ely, Nevada (along with EMD SD7 #401) to the Nevada Northern Railway Museum.[3]