American Locomotive Company (ALCO) produced a wide range of diesel-electric locomotives until it ceased manufacture in 1969.
| Model | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
|---|---|---|---|---|---|---|
| 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) | |
| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
|---|---|---|---|---|---|---|---|
| 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) |  |
| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
|---|---|---|---|---|---|---|---|
| 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) | |
| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
|---|---|---|---|---|---|---|---|
| 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) |  |
| Model | Specification | Build date | Total produced | Wheel arrangement | Prime mover | Power output | Image |
|---|---|---|---|---|---|---|---|
| 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) |  |
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 | Image |
|---|---|---|---|---|---|---|---|
| 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) | |
| 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) |  |
| 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) |  |
| Model | Specification | Build date | Total produced | Wheel arrangement | Main engine | Power output | Image |
|---|---|---|---|---|---|---|---|
| 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 | - | ||||
| 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 |
The EMD E5 is a 2,000-horsepower (1,500 kW), A1A-A1A passenger train-hauling diesel locomotive manufactured by Electro-Motive Corporation, and its corporate successor, General Motors' Electro-Motive Division (EMD) of La Grange, Illinois, and produced exclusively for the Chicago, Burlington and Quincy Railroad, and its subsidiaries, during 1940 and 1941. The E5 was distinguished from the otherwise very similar E3, E4 and E6 by being clad in polished stainless steel to match the Burlington's Zephyr trains. It also featured unique small grill-like ornamentation on both sides of the upper headlight. Like the other models in the E-series, the E5 had a sloping “slant nose” and it was equipped with two headlights — a regular stationary headlight above a gyrating Mars signal light. The E5 was the sixth in the EMD E-unit series.
The EMD E6 was a 2,000-horsepower (1,500 kW), A1A-A1A, streamlined passenger train locomotive manufactured by Electro-Motive Corporation, and its corporate successor, General Motors Electro-Motive Division, of La Grange, Illinois. The cab version, E6A, was manufactured from November 1939 to September 1942; 91 were produced. The booster version, E6B, was manufactured from April 1940 to February 1942; 26 were produced. The 2,000-horsepower (1,500 kW) was achieved by putting two 1,000-horsepower (750 kW), 12-cylinder, model 567 engines in the engine compartment. Each engine drove its own electrical generator to power the traction motors. The E6 was the seventh model in a long line of passenger diesels of similar design known as EMD E-units.
The E7 was a 2,000-horsepower (1,500 kW), A1A-A1A passenger train locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois. 428 cab versions, or E7As, were built from February 1945 to April 1949; 82 booster E7Bs were built from March 1945 to July 1948. The 2,000 hp came from two 12 cylinder model 567A engines. Each engine drove its own electrical generator to power the two traction motors on one truck. The E7 was the eighth model in a line of passenger diesels of similar design known as EMD E-units, and it became the best selling E model upon its introduction.
The EMC E4 was a 2,000 horsepower (1,500 kW), A1A-A1A passenger train-hauling diesel locomotive built by the Electro-Motive Corporation of La Grange, Illinois. All were built for the Seaboard Air Line Railway. The E4 was the fifth model in a long line of passenger diesels of similar design known as EMD E-units.
The EMC E3 is a 2,000 horsepower (1,500 kW), A1A-A1A passenger train locomotive that was manufactured by Electro-Motive Corporation of La Grange, Illinois. The EMC demonstrator #822 was released from La Grange for test on September 12, 1938. The cab version, or E3A, was manufactured from September 1938 to June 1940, and 17 were produced. The booster version, or E3B, was manufactured in March 1939 and September 1939, and 2 were produced. The 2,000 hp (1,500 kW) was achieved by putting two 1,000 horsepower (750 kW), 12-cylinder, model 567 engines in the engine compartment. Each engine drove its own electrical generator to power the traction motors. The E3 was the fourth model in a long line of passenger diesels of similar design known as EMD E-units.
The E8 is a 2,250-horsepower (1,678 kW), A1A-A1A passenger-train locomotive built by General Motors' Electro-Motive Division (EMD) of La Grange, Illinois. A total of 450 cab versions, or E8As, were built from August 1949 to January 1954, 447 for the U.S. and 3 for Canada. 46 E8Bs were built from December 1949 to January 1954, all for the U.S. The 2,250 hp came from two 12 cylinder model 567B engines, each driving a generator to power the two traction motors on one truck. The E8 was the ninth model in the line of passenger diesels of similar design known as EMD E-units. Starting in September 1953, a total of 21 E8As were built which used either the 567BC or 567C engines.
The E9 is a 2,400-horsepower (1,790 kW), A1A-A1A passenger train-hauling diesel locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois, between April 1954 and January 1964. 100 cab-equipped A units were produced and 44 cabless booster B units, all for service in the United States. The E9 was the tenth and last model of EMD E-unit and differed from the earlier E8 as built only by the newer engines and a different, flusher-fitting mounting for the headlight glass, the latter being the only visible difference. Since some E8s were fitted with this, it is not a reliable way to distinguish the two. The E9 has two 1,200 hp (895 kW), V12 model 567C engines, each engine driving one generator to power two traction motors.
The EMC E2 was an American passenger-train diesel locomotive which as a single unit developed 1,800 horsepower (1,300 kW), from two (2) 900 horsepower (670 kW) prime movers. These locomotives were typically operated as a unit set or ; where the three unit lashup developed 5400 horsepower. This was almost the ideal horsepower required for the tonnage of a 15 - 18 car passenger train, operated over the ruling grades of virtually all of the mileage between major American cities. The units were of the A1A-A1A wheel arrangement, and manufactured by Electro-Motive Corporation (EMC), later Electro-Motive Diesel (EMD) of La Grange, Illinois.
The EMC E1 was an early passenger-train diesel locomotive developing 1,800 hp, with an A1A-A1A wheel arrangement, and manufactured by Electro-Motive Corporation of La Grange, Illinois. They were built during 1937 and 1938 for the Atchison, Topeka and Santa Fe Railway for a new generation of diesel-powered streamlined trains. 8 cab-equipped lead A units and three cabless booster B units were built. The initial three locomotives were AB pairs built to haul the Santa Fe's Super Chief diesel streamliners, while the others were built as single A units to haul shorter trains. The locomotives were diesel-electrics with two 900 hp (670 kW) Winton 201-A engines each, with each engine driving its own generator to power the traction motors. The E1 was the second model in a long line of passenger diesels of similar design known as EMD E-units. All Winton 201A-engined Santa Fe passenger units, including the E1s, were extensively rebuilt into the 80-class E8M engines in 1952-53. These were similar to production E8 models, but derated to 2000 hp so as not to burn out the early traction (axle) motors.
The EMC EA/EB is an early passenger train-hauling diesel locomotive built from May 16, 1937, to 1938 by Electro-Motive Corporation of La Grange, Illinois for the Baltimore and Ohio Railroad. They were the first model in a long line of passenger diesels of similar design known as EMD E-units. Each locomotive unit developed 1,800 horsepower (1,300 kW) from two 900 hp (670 kW) Winton 201-A diesel engines, driving the wheels through an electric transmission—the generator driven by each engine provided current for traction motors. The locomotives were of A1A-A1A wheel arrangement—two three-axle trucks of which only the outer two axles were powered. Six two-unit 3,600 hp (2,700 kW) locomotives were produced, each consisting of a lead cab-equipped EA A unit and a cabless booster EB B unit. They were numbered 51 through 56; the A units bore the bare number and the B units the number followed by 'X'.
The EMD FT is a 1,350-horsepower (1,010 kW) diesel-electric locomotive that was produced between March 1939 and November 1945, by General Motors' Electro-Motive Corporation (EMC), later known as GM Electro-Motive Division (EMD). The "F" stood for Fourteen Hundred (1400) horsepower and the "T" for Twin, as it came standard in a two-unit set. The design was developed from the TA model built for the C,RI&P in 1937, and was similar in cylinder count, axle count, length, and layout. All told 555 cab-equipped ”A” units were built, along with 541 cabless booster or ”B” units, for a grand total of 1,096 units. The locomotives were all sold to customers in the United States. It was the first model in EMD's very successful F-unit series of cab unit freight diesels and was the locomotive that convinced many U.S. railroads that the diesel-electric freight locomotive was the future. Many rail historians consider the FT one of the most important locomotive models of all time.
The EMD F2 was a freight-hauling diesel locomotive built by General Motors Electro-Motive Division between July 1946 and November 1946. It succeeded the FT model in GM-EMD's F-unit sequence, and was replaced in turn by the F3. The F2 was in many respects a transitional type between those two; it kept the 1,350 hp (1,010 kW) rated D8 generator from the FT due to late development of the new D12 generator intended for the F3, but in a revised carbody design and internal layout that would be continued through the rest of the F-unit series. 74 cab-equipped lead A units and 30 cabless booster B units were produced.
EMD F-units are a line of diesel-electric locomotives produced between November 1939 and November 1960 by General Motors Electro-Motive Division and General Motors-Diesel Division. Final assembly for all F-units was at the GM-EMD plant at La Grange, Illinois, and the GMDD plant in London, Ontario. They were sold to railroads throughout the United States, Canada and Mexico, and a few were exported to Saudi Arabia. The term F-unit refers to the model numbers given to each successive type, all of which began with the letter F. The F originally meant "fourteen", as in 1,400 horsepower (1,000 kW), not "freight". Longer EMD E-units for passenger service had twin 900-horsepower (670 kW) diesel engines. The E meant "eighteen" as in 1,800 horsepower (1,300 kW). Similarly, for early model EMD switchers, S meant "six hundred" and N meant "nine hundred horsepower".
The EMD F7 is a model of 1,500-horsepower (1,100 kW) diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD).
The EMD F9 is a 1,750 horsepower (1,300 kW) Diesel-electric locomotive produced between February 1953 and May 1960 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD). It succeeded the F7 model in GM-EMD's F-unit sequence. Final assembly was at GM-EMD's La Grange, Illinois plant. The F9 was also built in Canada by General Motors Diesel at their London, Ontario plant. A total of 101 cab-equipped lead A units and 156 cabless booster B units were built. The F9 was the fifth model in GM-EMD's highly successful "F" series of cab unit diesel locomotives.
The EMD FP7 is a 1,500 horsepower (1,100 kW), B-B dual-service passenger and freight-hauling diesel locomotive produced between June 1949 and December 1953 by General Motors' Electro-Motive Division and General Motors Diesel. Final assembly was at GM-EMD's La Grange, Illinois plant, excepting locomotives destined for Canada, in which case final assembly was at GMD's plant in London, Ontario. The FP7 was essentially EMD's F7A locomotive extended by four feet to give greater water capacity for the steam generator for heating passenger trains.
The EMD FP9 is an American 1,750 horsepower (1,300 kW), B-B dual-service passenger and freight-hauling diesel locomotive that was produced between February 1954 and December 1959 by General Motors Electro-Motive Division, and General Motors Diesel. Final assembly was at GM-EMD's La Grange, Illinois plant, except for Canadian orders, which were assembled by Canadian subsidiary GMD at London, Ontario. The FP9 was essentially EMD's F9 locomotive extended by four feet to give greater steam generator and water capacity for hauling passenger trains. A total of 90 cab-equipped lead A units were built; unlike the freight series, no cabless booster B units were sold. Regular F9B units were sometimes used with FP9 A units, since they, lacking cabs, had more room for water and steam generators. The FP9 and its predecessor, the FP7, were offshoots of GM-EMD's highly successful F-unit series of cab unit diesel locomotives.
