FS Class 746

Specifications
Specifications
Configuration:;
• UIC	1′D1′ h4v
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.	1,110 mm (43.70 in)
Driver dia.	1,880 mm (74.02 in)
Trailing dia.	1,125 mm (44.29 in)
Length	14,085 mm (46 ft 2+1⁄2 in)
Axle load	16.2 tonnes (15.9 long tons; 17.9 short tons)
Loco weight	98.8 tonnes (97.2 long tons; 108.9 short tons)
Tender weight	49.6 tonnes (48.8 long tons; 54.7 short tons)
Total weight	149 tonnes
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	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, compound
High-pressure cylinder	490 mm × 680 mm (19.29 in × 26.77 in)
Low-pressure cylinder	720 mm × 680 mm (28.35 in × 26.77 in)
Valve gear	Walschaerts, Caprotti

Type and origin
Type and origin
Power type	Steam
Builder	Ernesto Breda (50),; Gio. Ansaldo & C. (10);
Build date	1923–1927
Total produced	60

FS Class 746
FS Class 746
	FS locomotive 746.031 as preserved
Power type
Type and origin
Power type	Steam
Builder	Ernesto Breda (50),; Gio. Ansaldo & C. (10);
Build date	1923–1927
Total produced	60
Configuration:;
Specifications
Configuration:;
• UIC	1′D1′ h4v
Gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.	1,110 mm (43.70 in)
Driver dia.	1,880 mm (74.02 in)
Trailing dia.	1,125 mm (44.29 in)
Length	14,085 mm (46 ft 2+1⁄2 in)
Axle load	16.2 tonnes (15.9 long tons; 17.9 short tons)
Loco weight	98.8 tonnes (97.2 long tons; 108.9 short tons)
Tender weight	49.6 tonnes (48.8 long tons; 54.7 short tons)
Total weight	149 tonnes
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	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, compound
High-pressure cylinder	490 mm × 680 mm (19.29 in × 26.77 in)
Low-pressure cylinder	720 mm × 680 mm (28.35 in × 26.77 in)
Valve gear	Walschaerts, Caprotti
Maximum speed
Performance figures
Maximum speed	100 km/h (62 mph)
Power output	1,750 CV (1,290 kW; 1,730 hp) at 75 km/h (47 mph)
Tractive effort	14,000 kgf (137 kN; 30,900 lbf)

The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 746 (Italian: Gruppo 746) is a class of 2-8-2 'Mikado' steam locomotive. These were the biggest locomotives ever built by the Ferrovie dello Stato, even though not the fastest, which were the Class 691s.

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