FS Class 685

Specifications
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);

Type and origin
Type and origin
Power type	Steam
Builder	Ernesto Breda,; Officine Meccaniche di Saronno,; Reggiane;
Build date	1912–1928
Total produced	271 + 120 rebuilds

FS Class 685
FS Class 685
	FS locomotive 685.089 in 2010
Power type
Type and origin
Power type	Steam
Builder	Ernesto Breda,; Officine Meccaniche di Saronno,; Reggiane;
Build date	1912–1928
Total produced	271 + 120 rebuilds
Configuration:;
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);
Maximum speed
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)

The Ferrovie dello Stato (FS; Italian State Railways) Class 685 (Italian: Gruppo 685) is a class of 2-6-2 'Prairie' express train steam locomotives. These are colloquially known as Regine ('Queens' in Italian), mirroring their fame as one of the most successful and appreciated Italian steam locomotives.

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