| ALCO S-1 and S-3 | |
| Powertype: | Diesel |
| Aarwheels: | B-B |
| Wheeldiameter: | 40inches |
| Minimumcurve: | 50° (118.31feet) |
| Wheelbase: | 302NaN2 |
| Length: | 45feet |
| Width: | 10inchesftNaNinchesin (ftin) |
| Height: | 14inchesftNaNinchesin (ftin) |
| Locoweight: | 199000lb |
| Fuelcap: | 635usgal |
| Primemover: | Alco 539T |
| Enginetype: | Four-stroke diesel |
| Aspiration: | Natural |
| Displacement: | 9572cuin |
| Generator: | GE GT 552-A |
| Tractionmotors: | 4 × GE 731 |
| Cylindercount: | Straight 6 |
| Cylindersize: | NaN× |
| Poweroutput: | 660hp |
| Tractiveeffort: | 49790lb |
| Locale: | North America, Brazil, United Kingdom |
The ALCO S-1 and S-3 were diesel-electric switcher locomotives produced by ALCO and their Canadian subsidiary Montreal Locomotive Works (MLW). The two locomotives differed only in trucks, with the S-1 using ALCO's own Blunt trucks, and the S-3 using AAR type A switcher trucks. The S-1 was built between April 1940 and June 1950, with a total of 543 completed, while the S-3 was constructed between February 1950 and November 1953 (MLW until 1957) with total sales of 300. A modified version, the S-10, was built by MLW only; 13 were built between January and June 1958.
The S-1 and S-3 are distinguishable externally from the very similar S-2 and S-4 switchers in that they have a smaller exhaust stack with a round base and a smaller radiator shutter area on the nose sides. The S-1/S-3 radiator shutter area is taller than it is wide, while the S-2/S-4 radiator area is wider. The smaller stack is due to the lack of turbocharging.
The S-10 is not externally distinguishable from later Canadian-built S-3 locomotives; it differed mostly in electrical equipment.
The S-1 and S-3 models were sold to an extensive list of railroads and industrial operators, as detailed below. Major owners of the S-1 included the New York Central Railroad (NYC), with 71 locomotives; the New Haven with 65 locomotives; the L&N with 45 locomotives; the C&NW, with 29 locomotives; and the Pennsylvania Railroad (PRR) with 27 locomotives. Major customers for the S-3 included the CP, with 101; the CN, with 49; the NYC, with 43 locomotives; the B&M, with 16; and the PRR, with 13. The MLW S-10 was sold only to the CP.
The totals below include export orders and MLW-built locomotives.
ALCO constructed approximately 535 S-1s for the US market between 1940 and 1950.
| Railroad | Quantity | Road numbers | |
|---|---|---|---|
| 2 | 6501–6502 | ||
| 3 | D-1–D-3 | ||
| Alco (demonstrator) | 1 | 660 | |
| Alco (plant switcher) | 1 | 5 | |
| 1 | GT-1304 | ||
| 1 | 2 | ||
| 2 | 2–3 | ||
| 3 | E106–E108 | ||
| 2 | 2303–2304 | ||
| 6 | 223–227, 250 | ||
| 3 | 304–306 | ||
| 2 | 100, 101 | ||
| 10 | 1163–1172 | ||
| 1 | 410 | ||
| 1 | 5 | ||
| 5 | 3001–3005 | ||
| 2 | 4, 6 | ||
| 2 | 1024, 1025 | ||
| 1 | 25 | ||
| 3 | 103–105 | ||
| 29 | 1202–1205, 1213, 1223–1229, 1232–1236, 1247–1258 | ||
| 5 | 11–15 | ||
| 3 | 56, 57, 69 | ||
| 2 | 6000–6001 | ||
| 1 | 101 | ||
| 1 | 2 | ||
| Day and Zimmerman (Iowa Army Ammunition Depot) | 1 | 3-100 | |
| 2 | DPC25.23, DPC25.24 | ||
| 4 | 66, 68, 70, 72 | ||
| 4 | 1–4 | ||
| 1 | 646 | ||
| 1 | 100 | ||
| 5 | 213–217 | ||
| 16 | 306–321 | ||
| 4 | 6601–6604 | ||
| 1 | 32 | ||
| 1 | 102 | ||
| 4 | 661–664 | ||
| 2 | 1001–1002 | ||
| 7 | 53, 56, 61, 62, 64–66 | ||
| 1 | 1 | ||
| 1 | 2 | ||
| 1 | 7 | ||
| 5 | 40–44 | ||
| 1 | 103 | ||
| 1 | 117 | ||
| 14 | 404–408, 413–420, 421 | ||
| 45 | 16–29, 34–68 | ||
| 8 | 953–960 | ||
| 2 | 8, 9 | ||
| 5 | 60–64 | ||
| 2 | 9007, 9008 | ||
| 4 | 1–4 | ||
| 5 | 5000-5004 | ||
| 7 | 3–7, 9, 10 | ||
| 3 | 9013-9015 | ||
| 65 | 0931–0995 | ||
| 1 | 1 | ||
| 71 | 590, 685–744, 864–873 | ||
| 1 | 85 | ||
| 1 | 131 | ||
| 5 | 30–34 | ||
| 27 | 5661–5670, 5954–5956, 9100–9103, 9237–9246 | ||
| 1 | 5 | ||
| 2 | 51, 52 | ||
| 4 | 1005-1008 | ||
| 1 | 9 | ||
| 2 | 20, 21 | ||
| 5 | 50-54 | ||
| 1 | 7372 | ||
| 9 | 15–17, 312–314, D840, D841, D810 | ||
| 1 | 52 | ||
| 1 | 51 | ||
| 1 | 1201 | ||
| 3 | 11–13 | ||
| 3 | 1–3 | ||
| 4 | 51, 52, 60, 61 | ||
| 4 | 1017–1020 | ||
| 3 | 2000, 2001, 2006 | ||
| 5 | 1–5 | ||
| 2 | 10, 11, 10 Sold to City of Prineville 102, 11 to Burlington Northern 11 | ||
| Steel Company of Wales (UK) | 5 | 801–805 | |
| 2 | 2, 3 | ||
| 1 | 51 | ||
| 3 | 700–702 | ||
| 2 | 104, 105 | ||
| 4 | 521–524 | ||
| 1 | 10 | ||
| 1 | 19 | ||
| 2 | 30, 31 | ||
| Texas Pacific-Missouri Pacific Terminal Railroad of New Orleans | 2 | 3, 4 | |
| 2 | 5911, 5912 | ||
| 1 | 101 | ||
| 1 | 10 | ||
| 4 | 451–454 | ||
| 1 | 54 | ||
| 11 | 7132-7136, 7141-7142, 7374-7375, 7459-7460 | ||
| 9 | 151–159 | ||
| 3 | 200, 203, 204 | ||
| 1 | 102 | ||
| 8 | 504–511 | ||
| 5 | 661–665 | ||
| Total | 543 |
ALCO and the Montreal Locomotive Works constructed approximately 300 S-3s for the North American market between 1950 and 1957.
| Railroad | Quantity | Road numbers | |
|---|---|---|---|
| Manufactured by ALCO | |||
| 1 | 8 | ||
| 4 | 4–7 | ||
| 16 | 1173–1188 | ||
| 2 | 101, 102 | ||
| 1 | 2104 | ||
| 6 | 1262–1267 | ||
| 7 | 1–7 | ||
| 1 | 101 | ||
| 1 | 18 | ||
| 7 | 6605–6611 | ||
| 1 | 7 | ||
| 1 | 1 | ||
| 1 | 51 | ||
| 1 | 661 | ||
| 1 | 997 | ||
| 7 | 69–75 | ||
| 2 | 961, 962 | ||
| 1 | 1 | ||
| 1 | 50 | ||
| 43 | 874–916 | ||
| 13 | 8873–8885 | ||
| 1 | 2 | ||
| 10 | 1023–1032 | ||
| 1 | 664 | ||
| 2 | 3, 4 | ||
| 1 | 32 | ||
| 2 | 21, 22 | ||
| 1 | 30 | ||
| 1 | 6 | ||
| ALCO total | 137 | ||
| Manufactured by MLW | |||
| 1 | 3 | ||
| 1 | 1 | ||
| 49 | 8450–8498 | ||
| 101 | 6500–6600 | ||
| 1 | 103 | ||
| 1 | 4 | ||
| 8 | D2–D9 | ||
| 1 | 106 | ||
| MLW subtotal | 163 | ||
| Total | 300 | ||
MLW constructed 13 S-10s in 1958, all for the Canadian Pacific Railway, numbered 6601–6613. These units were essentially similar to late-built S3s, though with minor updates to the electrical gear.
In 1959, MLW built a final order of 660 horsepower switchers for the Canadian Pacific, as model S-11, numbered 6614–6623. The internal machinery of these units was essentially the same as that of the S-10, but the car body was radically redesigned, with the radiator on the front end of the hood instead of on the sides.[1]
Numerous S-1 and S-3 locomotives remain in use, and several are preserved: