USATC class S 118
| USATC S 118 QGR class AC16, EAR class 27 |
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 An S 118 of the Sidirodromoi Ellinikou Kratos
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| Number: | 793 |
| Manufacturer: | Baldwin , ALCO , Porter , Davenport , Vulcan |
| Year of construction (s): | 1942-1948 |
| Type : | 1'D1 'h2 |
| Gauge : | 914, 1000, 1067 mm |
| Length over coupling: | k. A. |
| Height: | 3340 mm |
| Fixed wheelbase: | 4115 mm |
| Total wheelbase: | 8611 mm |
| Service mass: | 53.5 t |
| Service mass with tender: | 95.7 t |
| Friction mass: | 36.3 t |
| Wheel set mass : | 9.1 t |
| Coupling wheel diameter: | 1219 mm |
| Impeller diameter front: | 660 mm |
| Rear wheel diameter: | 914 mm |
| Control type : | Heusinger-Walschaert |
| Cylinder diameter: | 406 mm |
| Piston stroke: | 610 mm |
| Boiler overpressure: | 12.76 bar |
| Grate area: | 2.56 m² |
| Radiant heating surface: | 10.68 m² |
| Tubular heating surface: | 116.69 m² |
| Superheater area : | 34.75 m² |
| Water supply: | 19 m³ / 24 m³ |
| Fuel supply: | 9 tons of coal |
| Brake: | Air brake |
The USATC Class S 118 were war locomotives of the United States Army Transportation Corps (USATC). They were designed for narrow-gauge lines with gauges between 914 mm (3 feet) and 1067 mm (3.5 feet, Cape gauge). The construction with the 1'D1 'wheel arrangement ( Mikado , also called MacArthur during the Second World War ) superheated steam boiler , two-cylinder engine and Walschaerts control corresponded to American building principles.
A total of 793 units were built, 52 of them not until after the Second World War. Manufacturers were ALCO (338 pieces), Baldwin (286), Davenport (73), Vulcan (66) and Porter (30). The construction came from ALCO.
11 locomotives with 914 mm gauge went to the White Pass and Yukon route in Alaska . Cape gauge locomotives were used in Queensland, Australia, where they became the AC16 class of Queensland Government Railways (QGR) after the war .
The meter-gauge version was used in India , Burma and Malaysia , and after the war many locomotives made their way to Thailand and Tanganyika , where they later formed class 27 of the East African Railways (EAR). The Thai machines were retired in the early 1970s; however, some went to Cambodia , where they were still in use for a few years.
Three locomotives, No. 190 and 192 of the White Pass and Yukon Route and No. 221A of the QGR, have been preserved.
