FS Class 691

Specifications
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

Type and origin
Type and origin
Power type	Steam
Rebuilder	FS workshops,; Ernesto Breda;
Rebuild date	1928–1934

FS Class 691
FS Class 691
	FS locomotive 691.022 as preserved at the Museo nazionale della Scienza e della Tecnologia "Leonardo da Vinci", Milan
Power type
Type and origin
Power type	Steam
Rebuilder	FS workshops,; Ernesto Breda;
Rebuild date	1928–1934
Configuration:;
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
Maximum speed
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)
Preserved
Career
Preserved	33 rebuilt (from Class 690

The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 691 (Italian: Gruppo 691) is a class of 4-6-2 'Pacific' locomotives; they were the fastest and most powerful locomotives ever built for the Italian railways.

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