SFAI Class 1200
RA Class 420
RM Class 480
FS Class 420 |
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 An FS Class 420 locomotive |
| Type and origin |
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| Power type | Steam |
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| Builder | Cockerill, Breda, Ansaldo, Miani & Venturi, Maffei, MÁVAG, Maschinenfabrik Esslingen, Henschel & Son, Lokomotivfabrik der StEG, Naples Railway Works, Pietrarsa Railway Works, Hawthorn-Guppy of Naples |
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| Build date | 1873-1905 |
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| Total produced | 293 |
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| Specifications |
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Configuration:
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| • UIC | D'n2 |
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| Gauge | 1,435 mm (4 ft 8+1⁄2 in) |
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| Driver dia. | 1,220 mm (48.03 in) |
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| Length | 16,320 mm (53 ft 7 in) |
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| Axle load | 14.3 tonnes (14.1 long tons; 15.8 short tons) |
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| Loco weight | 55.7 tonnes (54.8 long tons; 61.4 short tons) |
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| Tender weight | 26.7 tonnes (26.3 long tons; 29.4 short tons) |
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| Fuel type | Coal |
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| Fuel capacity | 4,000 kg (8,800 lb) |
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| Water cap. | 9,000 L (2,000 imp gal; 2,400 US gal) |
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| Firebox: | |
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| • Grate area | 2.16 m2 (23.3 sq ft) |
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| Boiler pressure | 10 kg/cm2 (0.981 MPa; 142 psi) |
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| Heating surface | 166.63 m2 (1,793.6 sq ft) |
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| Cylinders | Two, outside |
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| Cylinder size | 530 mm × 610 mm (20.87 in × 24.02 in) |
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| Valve gear | Stephenson |
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| Performance figures |
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| Maximum speed | 45 km/h (28 mph) |
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| Power output | 620 PS (456 kW; 612 hp) |
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| Tractive effort | 11,450 kgf (112 kN; 25,200 lbf) |
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The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 420 (Italian: Gruppo 290), formerly SFAI Class 1200, Rete Adriatica Class 420 and Rete Mediterranea Class 480, was a 0-8-0 steam locomotive.
