The American Locomotive Company (ALCO), based in Schenectady, New York, United States produced a wide range of diesel-electric locomotives from its opening in 1901 until it ceased manufacture in 1969. This is a list of ALCO locomotive classes.

For individually notable locomotives, please see List of locomotives. There are numerous individual ALCO locomotives that are preserved in museums or heritage railways. In particular please see sublists List of preserved locomotives in the United States and List of preserved locomotives in Canada.

Boxcab locomotives

{|class="wikitable sortable" style="width: 100%"

!Model!!Build date!!Total<br />produced!!class="unsortable"|Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| 60-ton || 1925–1928 || 26 || B-B || Ingersoll-Rand || || 100px

|- style=text-align:center

| 100-ton || 1925–1928 || 7 || B-B || Ingersoll-Rand 10&nbsp;×&nbsp;12 (×2) || &nbsp;×&nbsp;2 ||100px

|- style=text-align:center

| New York Central 1525 || 1928 || 1 || B-B || Ingersoll-Rand /batteries/3rd rail || || 100px

|- style=text-align:center

| 66-ton ||1931 || 6 || B-B || McIntosh & Seymour 9½&nbsp;x&nbsp;10½ || ||

|-

|}

Switchers

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| ALCO 300 || — || 1931–1938 || 11 || B-B ||M&S 6-330 || ||100px

|- style=text-align:center

| ALCO 600 || — || 1931 || 1 || B-B || 6-531 || ||100px

|- style=text-align:center

| HH600 || — || 1931–1939 || 78 || B-B || 6-531 || ||

100px

|- style=text-align:center

| HH900 || — || 1937–1939 || 21 || B-B || 6-531T || || 100x100px

|- style=text-align:center

| HH660 || — || 1939–1940 || 43 || B-B || 6-538 || ||100x100px

|- style=text-align:center

| HH1000 || — || 1939–1940 || 34 || B-B || 6-538T || || 100x100px

|- style=text-align:center

| S-1 || E-1530 || 1940–1950 || 543 || B-B || 6-539 || || 100px

|- style=text-align:center

| S-2 || E-1540 || 1940–1950 || 1,462 || B-B || 6-539T || || 100px

|- style=text-align:center

| S-3 || E-1530A || 1950–1953 || 137 || B-B || 6-539 || ||

100px

|- style=text-align:center

| S-4 || E-1540A || 1949–1957|| 651 || B-B || 6-539T || || 100px

|- style=text-align:center

| S-5 || DL420 || 1951 || 1 || B-B || 6-251 || ||

|- style=text-align:center

| S-5 || DL-421 || 1954 || 7 || B-B || 6-251A || || 100px

|- style=text-align:center

| S-6 || DL-430 (1st) || 1955–1960 || 126 || B-B || 6-251B || || 100px

|- style=text-align:center

| SB-8/SSB-9 || DL-431/DL-461 || 1956 || 2 sets || B-B+B-B || 6-251B × 2 || × 2 ||

|- style=text-align:center

| T-6 || DL-440 || 1958–1969 || 57 || B-B || 6-251B || || 100px

|-

|}

Cab units

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| Rebel power cars || — || 1935, 1937 || 3 || 2-B || 6-531 || || 100px

|- style=text-align:center

| — || DL-103b || 1939 || 1 || A1A-A1A || 6-538T × 2 || × 2 ||

|- style=text-align:center

| — || DL-105 || 1940 || 3 || A1A-A1A || 6-539T × 2 || × 2 ||

|- style=text-align:center

| — || DL-107 || 1940–1941 || 8 || A1A-A1A || 6-539T × 2 || × 2 ||

|- style=text-align:center

| — || DL-108 || 1941 || 3 || A1A-A1A || 6-539T × 2 || × 2 ||

|- style=text-align:center

| — || DL-109 || 1941–1945 || 62|| A1A-A1A || 6-539T × 2 || × 2 || 100px

|- style=text-align:center

| — || DL-110 || 1942 || 1 || A1A-A1A || 6-539T × 2 || × 2 ||

|- style=text-align:center

| — || DL-202 || 1945 || 2 || B-B ||12-241 || ||

|- style=text-align:center

| — || DL-203 || 1945 || 1 || B-B ||12-241 || ||

|- style=text-align:center

| FA-1 ||DL-204, DL206, DL-208, DL-208A, DL-208B || 1946–1950 || 396 || B-B || 12-244A, B || ||

|- style=text-align:center

| FA-1 || DL-208C || 1950 || 21 || B-B || 12-244C || ||

|- style=text-align:center

| FB-1 ||DL205, DL-209, DL-209A, DL-209B || 1946–1950 || 213 || B-B || 12-244A, B || ||

|- style=text-align:center

| FB-1 || DL-209C || 1950 || 16 || B-B || 12-244C || ||

|- style=text-align:center

| FA-2 || DL-212, DL-212A || 1950–1956 || 308 || B-B ||12-244D, G || || 100px

|- style=text-align:center

| FPA-2 || DL-212, DL-212A || 1950–1951 || 54 || B-B ||12-244D || ||

|- style=text-align:center

| FB-2 || DL-213, DL-213A || 1950–1956 || 181 || B-B ||12-244D, G || ||

|- style=text-align:center

| FPB-2 || DL-213, DL-213A || 1950–1956 || 25 || B-B ||12-244D || ||

|- style=text-align:center

| PA-1 || DL-304, DL-304A, DL-304B || 1946–1949 || 169 || A1A-A1A ||16-244 || || 100px

|- style=text-align:center

| PB-1 || DL-305, DL-305A, DL-305B || 1946–1949 || 39 || A1A-A1A ||16-244 || ||

|- style=text-align:center

| PA-2 || DL-304C, DL-304D || 1950–1953 || 81 || A1A-A1A ||16-244 || ||

|- style=text-align:center

| PB-2 || DL-305, DL-305D || 1950–1953 || 8 || A1A-A1A ||16-244 || ||

|-

|}

Four-axle road switchers

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!class="unsortable"|Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| RS-1 || E-1641A || 1941–1960 || 469 || B-B || 6-244T, 6-539T || || 100px

|- style=text-align:center

| RS-2 || E-1661, E-1661A, E-1661B || 1946–1950 || 338 || B-B || 12-244 || ||

|- style=text-align:center

| RS-2 || E-1661C || 1950 || 30 || B-B || 12-244 || || 100px

|- style=text-align:center

| RS-3 || E-1662, E-1662A, E-1662B || 1950–1956 || 1,272 || B-B || 12-244 || || 100px

|- style=text-align:center

| RS-11 || DL-701 || 1956–1961 || 433 || B-B || 12-251 || || 100px

|- style=text-align:center

| RS-27 || DL-640 || 1959–1962 || 27 || B-B || 16-251 || || 100px

|- style=text-align:center

| RS-32 || DL-721 || 1961–1962 || 35 || B-B ||12-251 || || 100px

|- style=text-align:center

| RS-36 || DL-701XAP || 1962–1963 || 40 || B-B ||12-251 || || 100px

|-

|}

Six-axle road switchers

{|class="wikitable sortable" style="width: 100%;text-align:center;"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|-

| RSC-1 || || 1946 || 4 || A1A-A1A || 6-539T || ||

|-

| rowspan=3 | RSD-1 || E-1641 || 1946 || 6 || C-C || 6-244T, 6-539T || ||

|-

| E-1645 || 1942-1943 || 57 || C-C || 6-244T, 6-539T || || 100px

|-

| E-1646 || 1944–1945 || 100 || C-C || 6-244T, 6-539T || || 100px

|-

| rowspan=2 | RSC-2 || E-1661, E-1661A, E-1661B || 1946–1950 || 86 || A1A-A1A || 12-244 || ||

|-

| E-1661C || 1950 || 5 || A1A-A1A || 12-244 || ||

|-

| RSC-3 || E-1662, E-1662A, E-1662B || 1950–1955 || 99 || A1A-A1A || 12-244 || || 100px

|-

| RSD-4 || E-1663, E-1663A, E-1663B || 1951–1952 || 36 || C-C || 12-244 || || 100px

|-

| RSD-5 || E-1664, E-1664A, E-1664B || 1952–1955 || 204 || C-C || 12-244 || || 100px

|-

| RSD-7 || DL-600 || 1954 || 2 || C-C || 16-244 || || 100px

|-

| RSD-7 || DL-600A || 1955–1956 || 27 || C-C || 16-244 || ||

|-

| RSD-12 || DL-702 || 1956–1963 || 171 || C-C || 12-251B || || 100px

|-

| RSD-15 || DL-600B || 1956–1960 || 75 || C-C || 16-251B || || 100px

|-

|}

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.

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| C415 || DL-415 || 1966–1968 || 26 || B-B || 8-251F || || 100px

|- style=text-align:center

| C420 || DL-721A || 1963–1968 || 131 || B-B || 12-251C || || 100px

|- style=text-align:center

| C424 || DL-640A || 1963–1967 || 98 || B-B || 16-251B || || 100px

|- style=text-align:center

| C425 || DL-640B || 1964–1966 || 91 || B-B || 16-251C || || 100px

|- style=text-align:center

| C430 || DL-430 (2nd) || 1967–1968 || 16 || B-B || 16-251E || || 100px

|- style=text-align:center

| C628 || DL-628 || 1963–1968 || 186 || C-C || 16-251C || || 100px

|- style=text-align:center

| C630 || DL-630 || 1965–1968 || 133 || C-C || 16-251E || || 100px

|- style=text-align:center

| C636 || DL-636 || 1967–1968 || 63 || C-C || 16-251E || || 100px

|- style=text-align:center

| C855 || DL-855 || 1964 || 2 || B-B+B-B || Dual 16-251 || ||

|- style=text-align:center

| C855B || DL-856 || 1964 || 1 || B-B+B-B || Dual 16-251 || ||

|-

|}

Diesel-hydraulic locomotives

{|class="wikitable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| DH643 || DH-400 || 1964 || 3 || C-C || Dual 12-251C || || 100px

|-

|}

Military locomotives

{|class="wikitable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| MRS-1 or RSX-4 || E-1670 || 1953–1954 || 83 || C-C ||12-244D || || 100px

|-

|}

Export and narrow gauge locomotives

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

|FCA-3 ||DL212||1951-1953|| 23|| A1A-A1A || 12-244D || || 100px

|- style=text-align:center

| FD-3 ||DL500||1953|| 3 || C-C || 12-244D || ||

|- style=text-align:center

|FD-3 || DL500A||1955|| 16 || C-C ||12-244D || ||

|- style=text-align:center

| FPD-5 ||DL500A||1955–1956||12 || C-C ||12-244 || ||

|- style=text-align:center

| Renfe Class 316 || DL500A || 1957 || 25 || C-C || || || 100px

|- style=text-align:center

| FD-6 ||DL500B||1958–1968||141|| C-C ||12-251<BR>12-251B || <BR> ||

|- style=text-align:center

| || DL500B1 || || || - || || ||

|- style=text-align:center

| SEK class A-301 || DL500C || || || C-C || 12-251B || ||

|- style=text-align:center

| FD-7 ||DL500CI|| 1957-1958 || 99 || C-C || 12-251B || ||

|- style=text-align:center

| || DL500CP || 1957-1959 || 59 || - || || ||

|- style=text-align:center

| FD-9 ||DL500D|| || || C-C || 12-251b || ||

|- style=text-align:center

| FP-9 ||DL500G|| 1965–1973 ||131 || C-C || 12-251B || ||

|- style=text-align:center

| FPD 9|| DL500S || 1964-1966 || 23 || C-C ||ALCO 251-C || ||

|- style=text-align:center

| || DL503S || || || - || || ||

|- style=text-align:center

| || DL510 || || || - || || ||

|- style=text-align:center

| || DL515 || || || - || || ||

|- style=text-align:center

| || DL515I || || || - || || ||

|- style=text-align:center

| || DL521 || || || - || || ||

|- style=text-align:center

| || DL522G || || || - || || ||

|- style=text-align:center

| || DL530 || || || - || || ||

|- style=text-align:center

| RSD-8 (NSW&nbsp;48)|| DL531 ||1959–1970 ||212 || C-C || 6-251D || || 100px

|- style=text-align:center

| RSD-8 || DL531A ||1958–1959 ||103 || C-C || 6-251D || || 100px

|- style=text-align:center

| || DL531B || || || - || || ||

|- style=text-align:center

| || DL531G || || || - || || ||

|- style=text-align:center

| RS-8|| DL532 ||1966–1974 || 74 || B-B ||6-251D || ||

|- style=text-align:center

| SEK class A-201 || DL532B || 1961–1962 ||10 || B-B || 6-251D || || 100px

|- style=text-align:center

| || DL533 || || || - || || ||

|- style=text-align:center

| || DL534 || || || - || || ||

|- style=text-align:center

| RSD-35 || DL535 || 1963 ||40|| C-C || 6-251D || ||

|- style=text-align:center

| RSD-35 || DL535 || 1963 ||70(MLW)|| C-C || 6-251D || ||

|- style=text-align:center

| RSD-39 || DL535-S/DL535-T || 1965–1967 || 76 || C-C ||ALCO 251-D || || 100px

|- style=text-align:center

| YDM-4 RSD-30 || DL535A ||1961–1969 || 100 (#6020-#6049 and #6105-#6129) || C-C || 6-251D || || 100px

|- style=text-align:center

| ENAFER RSD-35 || DL535B || 1963, 1969, 1974 || 26 || C-C || || ||

|- style=text-align:center

| || DL535C || || || - || || ||

|- style=text-align:center

| DL535E|| DL535E ||1969<BR>completed by MLW ||10 || C-C || 6-251D || || 100x100px

|- style=text-align:center

| || DL535M || 1963 || 115 || - || || ||

|- style=text-align:center

| || DL535S || || || A1A-A1A || || ||

|- style=text-align:center

| || DL535T || || || - || || ||

|- style=text-align:center

| RSD-36|| DL536 || 1978 || 20 || C-C ||6-251D || ||

|- style=text-align:center

| Tunisian Railways 040-DK|| DL536B || || || - || || ||

|- style=text-align:center

| RSD-37||DL537 ||1965 || 12 || C-C ||6-251D || ||

|- style=text-align:center

| SEK class A-9101 || DL537 || 1965 || || C-C || 6-251D || || 100px

|- style=text-align:center

| || DL539 || || || - || || ||

|- style=text-align:center

| RSD-16 || DL540 || 1957–1959 || 130 || C-C || ALCO 12-251B || || 100px

|- style=text-align:center

| RSD-16|| DL541 || 1960–1968 || 77 || C-C ||12-251B || ||

|- style=text-align:center

| || DL542 || || || - || || ||

|- style=text-align:center

| SEK class A-321 || DL543 || 1961–1970 ||117 || C-C || 12-251C || || 100px

|- style=text-align:center

| || DL543A || || || - || || ||

|- style=text-align:center

| || DL543SPAP || || || - || || ||

|- style=text-align:center

| || DL544 || || || - || || ||

|- style=text-align:center

| || DL550<br/>DL550K|| 1964 || 1 || - || || ||

|- style=text-align:center

| || DL551 || || || - || || ||

|- style=text-align:center

| || DL551B || || || - || || ||

|- style=text-align:center

| DL-560|| DL560<br/>DL560A || 1963–1964 || 12 || C-C || 12-251B || ||

|- style=text-align:center

| || DL560B || 1966 || 3 || - || || ||

|- style=text-align:center

| 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 || || 100px

|- style=text-align:center

| || DL560D || 1974 || 15 || - || || ||

|-

|}

Montreal Locomotive Works Export locomotives

{|class="wikitable sortable" style="width: 100%"

!Model!!Specification!!Build date!!Total<br />produced!!Wheel<br>arrangement!!Prime mover!!Power output!!class="unsortable"|Image

|- style=text-align:center

| || MX615 || 1972–1979 ||74 || C-C-1 ||MLW 8-251A || ||

|- style=text-align:center

| || MX620 ||1973–1980 ||145 || C-C ||MLW 12-251C || || 100px

|- style=text-align:center

| || MX624 ||1975–1983 ||69 || C-C ||MLW 12-251E || ||

|- style=text-align:center

| || MX626 || 1972–1982|| 32|| C-C || MLW 12-251E || ||

|- style=text-align:center

| OSE class A-451 || MX627 || 1972–1978 || 33 || C-C ||MLW 12-251C || || 100px

|- style=text-align:center

| OSE class A-501 || MX636 || 1974–1980 || 10 || C-C || MLW 16-251E || || 100px

|- style=text-align:center

| || MXS620 ||1973–1982 ||100 || C-C ||MLW 12-251E || || Double End Cab Units

|- style=text-align:center

| || MXS624 || 1973–1983 || 33 || C-C || MLW 16-251E || || Double End Cab Units

|- style=text-align:center

| || MXS627 || 1978–1980 || 10 || C-C || MLW 16-251C || || Double End Cab Units

|- style=text-align:center

| || MXS630 || 1978–1982 || 33 || C-C || MLW 16-251E || || Double End Cab Units

|}

References

  • ALCOWorld