| FS Class 940 |
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| Type and origin |
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| Power type | Steam |
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| Builder | |
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| Build date | 1922–1924 |
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| Total produced | 53 |
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| Specifications |
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Configuration:
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| • Whyte | 2-8-2T |
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| • UIC | 1′D1′ h2t |
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| Gauge | 1,435 mm (4 ft 8+1⁄2 in) |
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| Leading dia. | 860 mm (33.86 in) |
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| Driver dia. | 1,370 mm (53.94 in) |
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| Trailing dia. | 1,110 mm (43.70 in) |
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| Length | 13,178 mm (43 ft 2.8 in) |
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| Axle load | 15.4 tonnes (15.2 long tons; 17.0 short tons) |
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| Adhesive weight | 61.6 tonnes (60.6 long tons; 67.9 short tons) |
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| Loco weight | 87.3 tonnes (85.9 long tons; 96.2 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 3,500 kg (7,700 lb) |
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| Water cap. | 10,000 litres (2,200 imp gal; 2,600 US gal) |
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| Firebox: | |
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| • Grate area | 2.8 m2 (30 sq ft) |
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| Boiler pressure | 12 kg/cm2 (1.18 MPa; 171 psi) |
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| Heating surface | 152.92 m2 (1,646.0 sq ft) |
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Superheater:
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| • Heating area | 41.23 m2 (443.8 sq ft) |
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| Cylinders | Two, outside |
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| Cylinder size | 540 mm × 700 mm (21.26 in × 27.56 in) |
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| Valve gear | Walschaerts |
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| Performance figures |
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| Maximum speed | 65 km/h (40 mph) |
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| Power output | 980 PS (967 hp; 721 kW) |
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| Tractive effort | 13,500 kgf (132 kN; 29,800 lbf) |
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The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 940 (Italian: Gruppo 940) is a 2-8-2 steam tank locomotive, derived from the Class 740 tender locomotive.
