FS Class 851

Specifications
Specifications
Configuration:;
• UIC	C
Wheel diameter	1,510 mm (59 in)
Length	9,000 mm (30 ft)
Height	4,225 mm (13.862 ft)
Loco weight	43 or 44 tonnes (42 or 43 long tons; 47 or 49 short tons)
Boiler pressure	11.76 bar (1.176 MPa; 170.6 psi)
Heating surface:
• Firebox	1.53 m2 (16.5 sq ft)
Superheater:;
• Heating area	83.3 or 94.16 m2 (896.6 or 1,013.5 sq ft)
Cylinders	2
Cylinder size	430 mm (17 in)
Piston stroke	580 mm (23 in)

Type and origin
Type and origin
Power type	Steam
Builder	Ansaldo, Breda, Maffei, Costruzioni Meccaniche di Saronno, Officine Meccaniche
Build date	1898-1911
Total produced	207

FS 851
FS 851
	FS locomotive 851.186 on display in Como's public gardens, May 2013
Power type
Type and origin
Power type	Steam
Builder	Ansaldo, Breda, Maffei, Costruzioni Meccaniche di Saronno, Officine Meccaniche
Build date	1898-1911
Total produced	207
Configuration:;
Specifications
Configuration:;
• UIC	C
Wheel diameter	1,510 mm (59 in)
Length	9,000 mm (30 ft)
Height	4,225 mm (13.862 ft)
Loco weight	43 or 44 tonnes (42 or 43 long tons; 47 or 49 short tons)
Boiler pressure	11.76 bar (1.176 MPa; 170.6 psi)
Heating surface:
• Firebox	1.53 m2 (16.5 sq ft)
Superheater:;
• Heating area	83.3 or 94.16 m2 (896.6 or 1,013.5 sq ft)
Cylinders	2
Cylinder size	430 mm (17 in)
Piston stroke	580 mm (23 in)
Maximum speed
Performance figures
Maximum speed	65 km/h (40 mph)
Power output:;
• Continuous	294 kW (394 hp)
Tractive effort	6,950 kgf (15,300 lbf)

Class 851 locomotives were a class of steam locomotives of the Italian State Railways (FS).

They were designed and built by the Adriatic Network (RA) as machines for line service. In 1905, together with the locomotives of the classes FS 290, 600 and 870 ex-RA, they were included among those that the FS deemed worthy of further orders pending the completion of the designs of new classes suitable to cope with the development of passenger and freight traffic resulting from nationalization.

The advent of Class 940 locomotives relegated them to the role of shunting locomotives. With a geographical distribution complementary to that of class 835, these "interesting machines" served until the end of the steam traction era in Italy in the 1970s.

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