Switchers
| Model | Specification | Build date | Total produced |
Wheel arrangement |
Prime mover | Power output | Image |
|---|---|---|---|---|---|---|---|
| ALCO 300 | — | 1931–1938 | 9 | 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 | 76 | 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 | 546 | B-B | 6-539 | 660 hp (490 kW) | |
| S-2 | E-1540 | 1940–1950 | 1465 | 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) |
Read more about this topic: List Of ALCO Diesel Locomotives