FS Class 552

Specifications
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B n2
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	960 mm (37.80 in)
Driver dia.	1,920 mm (75.59 in)
Length	9,173 mm (30 ft 1.1 in)
Axle load	14.8 tonnes (14.6 long tons; 16.3 short tons)
Loco weight	48.3 tonnes (47.5 long tons; 53.2 short tons)
Tender weight	29.9 tonnes (29.4 long tons; 33.0 short tons)
Fuel type	Coal
Fuel capacity	4,000 kg (8,800 lb)
Water cap.	12,000 L (2,600 imp gal; 3,200 US gal)
Firebox:
• Grate area	2.3 m2 (25 sq ft)
Boiler pressure	12 kg/cm2 (1.18 MPa; 171 psi)
Heating surface	163.9 m2 (1,764 sq ft)
Cylinders	Two, outside
Cylinder size	480 mm × 600 mm (18.90 in × 23.62 in)
Valve gear	Stephenson

Type and origin
Type and origin
Power type	Steam
Builder	Gio. Ansaldo & C. (12),; Ernesto Breda (24);
Build date	1890–1901
Total produced	36

RA 180 bis
FS Class 552
RA 180 bis; FS Class 552
	FS locomotive 552.036 as preserved at the Museo nazionale scienza e tecnologia, Milan
Power type
Type and origin
Power type	Steam
Builder	Gio. Ansaldo & C. (12),; Ernesto Breda (24);
Build date	1890–1901
Total produced	36
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B n2
Gauge	1,435 mm (4 ft 8+1⁄2 in)
Leading dia.	960 mm (37.80 in)
Driver dia.	1,920 mm (75.59 in)
Length	9,173 mm (30 ft 1.1 in)
Axle load	14.8 tonnes (14.6 long tons; 16.3 short tons)
Loco weight	48.3 tonnes (47.5 long tons; 53.2 short tons)
Tender weight	29.9 tonnes (29.4 long tons; 33.0 short tons)
Fuel type	Coal
Fuel capacity	4,000 kg (8,800 lb)
Water cap.	12,000 L (2,600 imp gal; 3,200 US gal)
Firebox:
• Grate area	2.3 m2 (25 sq ft)
Boiler pressure	12 kg/cm2 (1.18 MPa; 171 psi)
Heating surface	163.9 m2 (1,764 sq ft)
Cylinders	Two, outside
Cylinder size	480 mm × 600 mm (18.90 in × 23.62 in)
Valve gear	Stephenson
Maximum speed
Performance figures
Maximum speed	100 km/h (62 mph)
Power output	650 CV (478 kW; 641 hp)
Tractive effort	6,570 kgf (64.4 kN; 14,500 lbf)

The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 552 (Italian: Gruppo 552), formerly Rete Adriatica Class 180 bis, is a 4-4-0 steam locomotive; it was the final development in Italy of the 'American' express locomotive type.

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