| ALCO RSD-12 | |
| Powertype: | Diesel-electric |
| Builder: | American Locomotive Company Montreal Locomotive Works |
| Buildmodel: | RSD-12 |
| Builddate: | April 1956 - March 1963 |
| Totalproduction: | 171 |
| Poweroutput: | 1800hp |
| Aarwheels: | C-C |
| Primemover: | Alco 251B |
| Cylindercount: | 12 |
| Enginetype: | V12 Four-stroke diesel |
| Aspiration: | Turbocharged |
The ALCO RSD-12 was a C-C diesel-electric locomotive rated at 1800hp. 171 locomotives were produced - Used in much the same manner as its four-axle counterpart, the ALCO RS-11, though the six-motor design allowed better tractive effort at lower speeds.
| Railroad | Quantity | Road numbers | Notes | |
|---|---|---|---|---|
| 10 | 6700–6709 | Renumbered 2007–2016, 2014 and 2016 were sold to Baltimore and Ohio Railroad, then were purchased by Utah Railway on February 23, 1976. | ||
| 4 | 1801–1804 | |||
| New York, Chicago and St. Louis Railroad (“Nickel Plate Road”) | 9 | 325–333 | to Norfolk and Western Railway 2325-2333 in 1964 | |
| 25 | 8655–8679 | to Penn Central 6855–6879; then to Conrail 1101-1123 and rebuilt into Alco mt6. 14 went to Norfolk Southern and 9 to CSX 1006-1016 with two retired upon Conrail purchase. All retired in 2020. | ||
| 21 | 7000–7020 | Renumbered 2950–2970, rebuilt from RSD-5 locomotives with a new motor and carbody, retaining generators and bogeys[1] [2] | ||
| 19 | 1502–1508, 509–520 | |||
| 73 | 7400–7472 | |||
| Companhia Siderúrgica Nacional (Brazil) | 10 | 3501–3510 | ||
| Total | 171 |
• Nickel Plate Road #329 is preserved at a museum in Bellevue, Ohio.
• Southern Pacific #2954 and #2958 are preserved at the Southern California Railroad Museum in Perris, California. Both of these units are rebuilt from RSD-5s.
• Paperton Junction Southern (ex-SP #2962) is preserved at the Arkansas Railroad Museum in Pine Bluff, Arkansas.
• Lake Superior & Ishpeming #1804 partially survives in a shipyard in Escanaba, Michigan. It has no prime mover.