List of ALCO diesel locomotives
# List of ALCO diesel locomotives

American Locomotive Company (ALCO) produced a wide range of diesel-electric locomotives until it ceased manufacture in 1969.

## Boxcab locomotives

| Model | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - |
| 60-ton | 1924–1928 | 26 | B-B | Ingersoll-Rand 10 in × 12 in (254 mm × 305 mm) | 300 hp (220 kW) |
| 100-ton | 1925–1928 | 7 | B-B | Ingersoll-Rand 10 × 12 (×2) | 300 hp (220 kW) × 2 |
| New York Central 1525 | 1928 | 1 | B-B | Ingersoll-Rand 10 in × 12 in (254 mm × 305 mm)/batteries/3rd rail | 300 hp (220 kW) |
| 66-ton | 1931 | 1 | B-B | McIntosh & Seymour 9½ x 10½ | 300 hp (220 kW) |

## Switchers

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - | - |
| ALCO 300 | — | 1931–1938 | 11 | B-B | M&S 6-330 | 300 hp (220 kW) |
| ALCO 600 | — | 1931 | 1 | B-B | 6-531 | 600 hp (450 kW) |
| HH600 | — | 1931–1939 | 78 | B-B | 6-531 | 600 hp (450 kW) |
| HH900 | — | 1937–1939 | 21 | B-B | 6-531T | 900 hp (670 kW) |
| HH660 | — | 1939–40 | 43 | B-B | 6-538 | 660 hp (490 kW) |
| HH1000 | — | 1939–1940 | 34 | B-B | 6-538T | 1,000 hp (750 kW) |
| S-1 | E-1530 | 1940–1950 | 543 | B-B | 6-539 | 660 hp (490 kW) |
| S-2 | E-1540 | 1940–1950 | 1462 | B-B | 6-539T | 1,000 hp (750 kW) |
| S-3 | E-1530A | 1950–1953 | 137 | B-B | 6-539 | 660 hp (490 kW) |
| S-4 | E-1540A | 1949–1957 | 651 | B-B | 6-539T | 1,000 hp (750 kW) |
| S-5 | DL420 | 1951 | 1 | B-B | 6-251 | 800 hp (600 kW) |
| S-5 | DL-421 | 1954 | 7 | B-B | 6-251A | 800 hp (600 kW) |
| S-6 | DL-430 (1st) | 1955–1960 | 126 | B-B | 6-251B | 900 hp (670 kW) |
| SB-8/SSB-9 | DL-431/DL-461 | 1956 | 2 sets | B-B+B-B | 6-251B × 2 | 900 hp (670 kW) × 2 |
| T-6 | DL-440 | 1958–1969 | 57 | B-B | 6-251B | 1,000 hp (750 kW) |

## Cab units

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - | - |
| Rebel power cars | — | 1935, 1937 | 3 | 2-B | 6-531 | 600 hp (0.45 MW) |
| — | DL-103b | 1939 | 1 | A1A-A1A | 6-538T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-105 | 1940 | 3 | A1A-A1A | 6-539T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-107 | 1940–1941 | 8 | A1A-A1A | 6-539T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-108 | 1941 | 3 | A1A-A1A | 6-539T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-109 | 1941–1945 | 62 | A1A-A1A | 6-539T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-110 | 1942 | 1 | A1A-A1A | 6-539T × 2 | 1,000 hp (0.75 MW) × 2 |
| — | DL-202 | 1945 | 2 | B-B | 12-241 | 1,500 hp (1.12 MW) |
| — | DL-203 | 1945 | 1 | B-B | 12-241 | 1,500 hp (1.12 MW) |
| FA-1 | DL-204, DL206, DL-208, DL-208A, DL-208B | 1946–1950 | 396 | B-B | 12-244A, B | 1,500 hp (1.12 MW) |
| FA-1 | DL-208C | 1950 | 21 | B-B | 12-244C | 1,600 hp (1.19 MW) |
| FB-1 | DL205, DL-209, DL-209A, DL-209B | 1946–1950 | 213 | B-B | 12-244A, B | 1,500 hp (1.12 MW) |
| FB-1 | DL-209C | 1950 | 16 | B-B | 12-244C | 1,600 hp (1.19 MW) |
| FA-2 | DL-212, DL-212A | 1950–1956 | 308 | B-B | 12-244D, G | 1,600 hp (1.19 MW) |
| FPA-2 | DL-212, DL-212A | 1950–1951 | 54 | B-B | 12-244D | 1,600 hp (1.19 MW) |
| FB-2 | DL-213, DL-213A | 1950–1956 | 181 | B-B | 12-244D, G | 1,600 hp (1.19 MW) |
| FPB-2 | DL-213, DL-213A | 1950–1956 | 25 | B-B | 12-244D | 1,600 hp (1.19 MW) |
| PA-1 | DL-304, DL-304A, DL-304B | 1946–1949 | 169 | A1A-A1A | 16-244 | 2,000 hp (1.49 MW) |
| PB-1 | DL-305, DL-305A, DL-305B | 1946–1949 | 39 | A1A-A1A | 16-244 | 2,000 hp (1.49 MW) |
| PA-2 | DL-304C, DL-304D | 1950–1953 | 81 | A1A-A1A | 16-244 | 2,250 hp (1.68 MW) |
| PB-2 | DL-305, DL-305D | 1950–1953 | 8 | A1A-A1A | 16-244 | 2,250 hp (1.68 MW) |

## Four-axle road switchers

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - | - |
| RS-1 | E-1641A | 1941–1960 | 469 | B-B | 6-539T | 1,000 hp (0.75 MW) |
| RS-2 | E-1661, E-1661A, E-1661B | 1946–1950 | 338 | B-B | 12-244 | 1,500 hp (1.12 MW) |
| RS-2 | E-1661C | 1950 | 30 | B-B | 12-244 | 1,600 hp (1.19 MW) |
| RS-3 | E-1662, E-1662A, E-1662B | 1950–1956 | 1272 | B-B | 12-244 | 1,600 hp (1.19 MW) |
| RS-11 | DL-701 | 1956–1961 | 355 | B-B | 12-251 | 1,800 hp (1.34 MW) |
| RS-27 | DL-640 | 1959–1962 | 27 | B-B | 16-251 | 2,400 hp (1.79 MW) |
| RS-32 | DL-721 | 1961–1962 | 35 | B-B | 12-251 | 2,000 hp (1.49 MW) |
| RS-36 | DL-701XAP | 1962–1963 | 40 | B-B | 12-251 | 1,800 hp (1.34 MW) |

## Six-axle road switchers

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - | - |
| RSC-1 | | 1946 | 4 | A1A-A1A | 6-539T | 1,000 hp (0.75 MW) |
| RSD-1 | E-1641 | 1946 | 6 | C-C | 6-539T | 1,000 hp (0.75 MW) |
| RSD-1 | E-1645 | 1942-1943 | 44 | C-C | 6-539T | 1,000 hp (0.75 MW) |
| RSD-1 | E-1646 | 1944–1945 | 100 | C-C | 6-539T | 1,000 hp (0.75 MW) |
| RSC-2 | E-1661, E-1661A, E-1661B | 1946–1950 | 86 | A1A-A1A | 12-244 | 1,500 hp (1.12 MW) |
| RSC-2 | E-1661C | 1950 | 5 | A1A-A1A | 12-244 | 1,600 hp (1.19 MW) |
| RSC-3 | E-1662, E-1662A, E-1662B | 1950–1955 | 99 | A1A-A1A | 12-244 | 1,600 hp (1.19 MW) |
| RSD-4 | E-1663, E-1663A, E-1663B | 1951–1952 | 36 | C-C | 12-244 | 1,600 hp (1.19 MW) |
| RSD-5 | E-1664, E-1664A, E-1664B | 1952–1955 | 204 | C-C | 12-244 | 1,600 hp (1.19 MW) |
| RSD-7 | DL-600 | 1954 | 2 | C-C | 16-244 | 2,250 hp (1.68 MW) |
| RSD-7 | DL-600A | 1955–1956 | 27 | C-C | 16-244 | 2,400 hp (1.79 MW) |
| RSD-12 | DL-702 | 1956–1963 | 171 | C-C | 12-251B | 1,800 hp (1.34 MW) |
| RSD-15 | DL-600B | 1956–1960 | 75 | C-C | 16-251B | 2,400 hp (1.79 MW) |

## Century series

ALCO announced its "Century Series" of diesel locomotives in 1963 as a leap forward in power and reliability, an attempt to compete more aggressively with GM-EMD and GE in the marketplace.

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output |
| - | - | - | - | - | - | - |
| C415 | DL-415 | 1966–1968 | 26 | B-B | 8-251F | 1,500 hp (1.12 MW) |
| C420 | DL-721A | 1963–1968 | 131 | B-B | 12-251C | 2,000 hp (1.49 MW) |
| C424 | DL-640A | 1963–1967 | 98 | B-B | 16-251B | 2,400 hp (1.79 MW) |
| C425 | DL-640B | 1964–1966 | 91 | B-B | 16-251C | 2,500 hp (1.86 MW) |
| C430 | DL-430 (2nd) | 1967–1968 | 16 | B-B | 16-251E | 3,000 hp (2.24 MW) |
| C628 | DL-628 | 1963–1968 | 186 | C-C | 16-251C | 2,750 hp (2.05 MW) |
| C630 | DL-630 | 1965–1968 | 133 | C-C | 16-251E | 3,000 hp (2.24 MW) |
| C636 | DL-636 | 1967–1968 | 63 | C-C | 16-251E | 3,600 hp (2.68 MW) |
| C855 | DL-855 | 1964 | 2 | B-B+B-B | Dual 16-251 | 5,500 hp (4.10 MW) |
| C855B | DL-856 | 1964 | 1 | B-B+B-B | Dual 16-251 | 5,500 hp (4.10 MW) |

## Diesel-hydraulic locomotives

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
| - | - | - | - | - | - | - | - |
| DH643 | DH-400 | 1964 | 3 | C-C | Dual 12-251C | 4,300 hp (3.21 MW) | |

## Military locomotives

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
| - | - | - | - | - | - | - | - |
| MRS-1 or RSX-4 | E-1670 | 1953–1954 | 83 | C-C | 12-244D | 1,600 hp (1.19 MW) | |

## Locomotives export and not exported

| Model | Specification | Build date | Total produced | Wheel arrangement | Main engine | Power output |
| - | - | - | - | - | - | - |
| FCA-3 | DL212 | 1951-1953 | 23 | A1A-A1A | 12-244D | 1,600 hp (1.19 MW) |
| FD-3 | DL500 | 1953 | 3 | C-C | 12-244D | 1,600 hp (1.19 MW) |
| FD-3 | DL500A | 1955 | 16 | C-C | 12-244D | 1,600 hp (1.19 MW) |
| FPD-5 | DL500A | 1955–1956 | 12 | C-C | 12-244 | 1,600 hp (1.19 MW) |
| Renfe Class 316 | DL500A | 1957 | 25 | C-C | | |
| FD-6 | DL500B | 1958–1968 | 141 | C-C | 12-251 12-251B | 1,600 hp (1.19 MW) 1,800 hp (1.34 MW) |
| | DL500B1 | | | - | | |
| SEK class A-301 | DL500C | | | C-C | 12-251B | 1,800 hp (1.34 MW) |
| FD-7 | DL500CI | 1957-1958 | 99 | C-C | 12-251B | 1,800 hp (1,340 kW) |
| | DL500CP | 1957-1959 | 59 | - | | |
| FD-9 | DL500D | | | C-C | 12-251b | 1,800 hp (1,340 kW) |
| FP-9 | DL500G | 1965–1973 | 131 | C-C | 12-251B | 1,800 hp (1,340 kW) |
| FPD 9 | DL500S | 1964-'65-´66 | 23 (En Argentina traidas de España) En España ¿? | -Co-Co | ALCO 251-C | 2180HP |
| | DL503S | | | - | | |
| | DL510 | | | - | | |
| | DL515 | | | - | | |
| | DL515I | | | - | | |
| | DL521 | | | - | | |
| | DL522G | | | - | | |
| | DL530 | | | - | | |
| RSD-8 (NSW 48) | DL531 | 1959–1970 | 212 | C-C | 6-251D | 1,060 hp (790 kW) |
| RSD-8 | DL531A | 1958–1959 | 103 | C-C | 6-251D | 1,060 hp (790 kW) |
| | DL531B | | | - | | |
| | DL531G | | | - | | |
| RS-8 | DL532 | 1966–1974 | 74 | B-B | 6-251D | 1,035 hp (770 kW) |
| SEK class A-201 | DL532B | 1961–1962 | 10 | B-B | 6-251D | 1,035 hp (0.77 MW) |
| | DL533 | | | - | | |
| | DL534 | | | - | | |
| RSD-39 | DL535-S/DL535-T | 1965–1967 | 736 | C-C | ALCO 251-D | 1,200 hp (890 kW) |
| RSD-35 | DL535 | 1963 | 70 locomotoras de Trocha ancha (1676mm) | -Co-Co | ALCO 251 D | 1425HP |
| RSD-35 | DL535 | 1963 | 40 locomotoras de Trocha metrica (1000mm) | -Co-Co | ALCO 251 D | 1425HP |
| Indian Railways YDM-4 RSD-30 | DL535A | 1961–1969 | 100 (#6020-#6049 and #6105-#6129) | C-C | 6-251D | 1,300 hp (0.97 MW) |
| ENAFER RSD-35 | DL535B | 1963, 1969, 1974 | 26 | C-C | | 1,200 hp (0.89 MW) |
| | DL535C | | | - | | |
| DL535E | DL535E | 1969 completed by MLW | 10 | C-C | 6-251D | 1,200 hp (0.89 MW) |
| | DL535M | 1963 | 115 | - | | |
| | DL535S | | | A1A-A1A | | |
| | DL535T | | | - | | |
| RSD-36 | DL536 | 1978 | 20 | C-C | 6-251D | 1,200 hp (890 kW) |
| Tunisian Railways 040-DK | DL536B | | | - | | |
| RSD-37 | DL537 | 1965 | 12 | C-C | 6-251D | 1,200 hp (890 kW) |
| SEK class A-9101 | DL537 | 1965 | | C-C | 6-251D | 993 kilowatts (1,332 hp) |
| | DL539 | | | - | | |
| RSD-16 | DL540 | 1957–1959 | 130 | Co--Co | ALCO 251B | 1,800 hp (1,340 kW) |
| RSD-16 | DL541 | 1960–1968 | 77 | C-C | 12-251B | 18,300 hp (13,650 kW) |
| | DL542 | | | - | | |
| SEK class A-321 | DL543 | 1961–1970 | 117 | C-C | 12-251C | 1,470 kilowatts (1,971 hp) |
| | DL543A | | | - | | |
| | DL543SPAP | | | - | | |
| | DL544 | | | - | | |
| | DL550 DL550K | 1964 | 1 | - | | |
| | DL551 | | | - | | |
| | DL551B | | | - | | |
| DL-560 | DL560 DL560A | 1963–1964 | 12 | C-C | 12-251B | 2,600 hp (1,940 kW) |
| | DL560B | 1966 | 3 | - | | |
| Indian Railways WDM-2/ALCO RSD-29 | DL560C | 1962-1997 | 2962, 18040 – 18079 (1962), 18112 – 18232 (1962 – 1963), 18245 – 18298 (1964 – 1965), 18337 – 18361 (1965) | C-C | 16-251B | 2,600 hp (1,940 kW) |
| | DL560D | 1974 | 15 | - | | |

## Montreal Locomotive Works Export locomotives

| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
| - | - | - | - | - | - | - | - |
| | MX615 | 1972–1979 | 74 | C-C-1 | MLW 8-251A | 1,200 hp (890 kW) | |
| | MX620 | 1973–1980 | 145 | C-C | MLW 12-251C | 2,000 hp (1,490 kW) | |
| | MX624 | 1975–1983 | 69 | C-C | MLW 12-251E | 2,400 hp (1,790 kW) | |
| | MX626 | 1972–1982 | 32 | C-C | MLW 12-251E | 2,400 hp (1,790 kW) | |
| OSE class A-451 | MX627 | 1972–1978 | 33 | C-C | MLW 12-251C | 2,750 hp (2,050 kW) | |
| OSE class A-501 | MX636 | 1974–1980 | 10 | C-C | MLW 16-251E | 3,600 hp (2,680 kW) | |
| | MXS620 | 1973–1982 | 100 | C-C | MLW 12-251E | 2,000 hp (1,490 kW) | Double End Cab Units |
| | MXS624 | 1973–1983 | 33 | C-C | MLW 16-251E | 2,400 hp (1,790 kW) | Double End Cab Units |
| | MXS627 | 1978–1980 | 10 | C-C | MLW 16-251C | 2,750 hp (2,050 kW) | Double End Cab Units |
| | MXS630 | 1978–1982 | 33 | C-C | MLW 16-251E | 3,000 hp (2,240 kW) | Double End Cab Units |
