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FS Class 685
FS locomotive 685.089 in 2010
Type and origin
Power type
Steam
Builder
Ernesto Breda,
Officine Meccaniche di Saronno,
Reggiane
Build date
1912–1928
Total produced
271 + 120 rebuilds
Specifications
Configuration:
• UIC
1′C1′ h4
Gauge
1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.
960 mm (37.80 in)
Driver dia.
1,850 mm (72.83 in)
Trailing dia.
1,220 mm (48.03 in)
Length
11,730 mm (38 ft 5+3⁄4 in)
Axle load
15.1 tonnes (14.9 long tons; 16.6 short tons)
Loco weight
70.8 tonnes (69.7 long tons; 78.0 short tons)
Tender weight
48.6 tonnes (47.8 long tons; 53.6 short tons)
Fuel type
Coal
Fuel capacity
6,000 kg (13,000 lb)
Water cap.
22,000 litres (4,800 imp gal; 5,800 US gal)
Firebox:
• Grate area
3.5 m2 (38 sq ft)
Boiler pressure
12 kg/cm2 (1,180 kPa; 171 psi)
Heating surface
191.8 m2 (2,065 sq ft)
Superheater:
• Heating area
48.54 m2 (522.5 sq ft)
Cylinders
Four, simple
Cylinder size
420 mm × 650 mm (16.54 in × 25.59 in)
Valve gear
Walschaerts (early production),
Caprotti (late production)
Performance figures
Maximum speed
120 km/h (75 mph)
Power output
1,250 CV (919 kW; 1,230 hp)
Tractive effort
11,300 kgf (111 kN; 24,900 lbf)
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