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FS Class 691
FS locomotive 691.022 as preserved at the Museo nazionale della Scienza e della Tecnologia "Leonardo da Vinci", Milan
Type and origin
Power type
Steam
Rebuilder
FS workshops,
Ernesto Breda
Rebuild date
1928–1934
Specifications
Configuration:
• UIC
2′C1′ h4
Gauge
1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.
1,090 mm (42.91 in)
Driver dia.
2,030 mm (79.92 in)
Trailing dia.
1,230 mm (48.43 in)
Length
13,880 mm (45 ft 6+1⁄2 in)
Axle load
20 tonnes (20 long tons; 22 short tons)
Loco weight
96 tonnes (94 long tons; 106 short tons)
Tender weight
56 tonnes (55 long tons; 62 short tons)
Total weight
152 tonnes
Fuel type
Coal
Fuel capacity
5,500 kg (12,100 lb)
Water cap.
29,000 litres (6,400 imp gal; 7,700 US gal)
Firebox:
• Grate area
4.3 m2 (46 sq ft)
Boiler pressure
16 kg/cm2 (1.57 MPa; 228 psi)
Heating surface
237 m2 (2,550 sq ft)
Superheater:
• Heating area
112 m2 (1,210 sq ft)
Cylinders
Four, simple
Cylinder size
450 mm × 680 mm (17.72 in × 26.77 in)
Valve gear
Walschaerts
Performance figures
Maximum speed
130 km/h (81 mph)
Power output
1,750 CV (1,290 kW; 1,730 hp)
Tractive effort
14,500 kgf (142 kN; 32,000 lbf)
Career
Preserved
33 rebuilt (from Class 690
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