FS Class 640 II

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FS Class 640
Trenitalia Class 640 No 640-143 (8062232362).jpg
FS locomotive 640.143 in 2012
Type and origin
Power typeSteam
Builder
Build date1907-1911
Total produced173
Specifications
Configuration:
 • UIC1′C h2
Gauge1,435 mm (4 ft 8+12 in) standard gauge
Leading dia.960 mm (37.80 in)
Driver dia.1,850 mm (72.83 in)
Length9,670 mm (31 ft 8+34 in)
Axle load14.7 t (14.5 long tons; 16.2 short tons)
Loco weight54.5 t (53.6 long tons; 60.1 short tons)
Tender weight35.3 t (34.7 long tons; 38.9 short tons)
Total weight89,8 tons
Fuel typeCoal
Fuel capacity6,000 kg (13,000 lb)
Water cap.15,000 L (3,300 imp gal; 4,000 US gal)
Firebox:
 • Firegrate area
2.42 m2 (26.0 sq ft)
Boiler pressure12 kg/cm2 (1.18 MPa; 171 psi)
Heating surface108.5 m2 (1,168 sq ft)
Superheater:
 • Heating area33.5 m2 (361 sq ft)
CylindersTwo
Cylinder size540 mm × 700 mm (21.26 in × 27.56 in)
Valve gearWalschaerts, Caprotti
Performance figures
Maximum speed100 km/h (62 mph)
Power output800 CV (588 kW; 789 hp)
Tractive effort10,000 kgf (98.1 kN; 22,000 lbf)
Career
Preserved15 rebuilt (from )

The Ferrovie dello Stato (FS; Italian State Railways) Class 640 (Italian: Gruppo 640 is a class of 2-6-0 'Mogul' steam locomotives in Italy. Commonly nicknamed "Signorine" (Italian: 'young ladies'), a nickname shared with the similar Class 625, these locomotives were the first superheated steam locomotives in Italy.[1]

Design and construction[]

When the FS were created in 1905, Chief Mechanical Engineer Giuseppe Zara undertook a process to design of a standard range of locomotives; one of these was the , a light express engine which, together with the other designs, shared the features of being compound locomotives. However, with the diffusion in Germany (then in close ties with Italy because of the Triple Alliance) of the Schmidt superheater, a decision to build there a batch of 24 non-compound and superheated version of the Class 630 (keeping all the other features, including the Italian bogie and the peculiar inside-cylinders/outside valve chests and valve gear) was taken.[2] Results were highly successful, and subsequently almost all steam locomotives in Italy would be built with simple expansion and superheating.

The first locomotives were built by the German firm Schwartzkopff (as Italian industry lacked experience with the superheating technology), with other Italian firms building the rest, for a total of 169; four more Class 640 were added in 1951 when the railway company for which they had been built for (Strade Ferrate di Biella) was incorporated in the FS.

All the Class 640 were fitted with a unique three-axle tender with a water capacity of 15,000 l (4,000 US gal)

Operations[]

Originally pulling the principal express trains on the Italian mainlines, after a few years the Class 640 locomotives were replaced in these services by the more powerful Class 680 and Class 685 2-6-2 locomotives; they were then assigned to pulling passenger trains on secondary lines with level ground. They enjoyed a very long career, surviving up to the end of regular Italian steam services in the 1970s.[1]

Modifications[]

Between 1929 and 1931 15 Class 630 locomotives were rebuilt with superheater, simple expansion and Caprotti valve gear; their running numbers were retained with the addition of 300, making them form the 640.3XX subclass.[1]

Preservation[]

Sixteen Class 640 locomotives survive into preservation; of these, two (the 143 and 091) are currently operational and available for heritage trains, while others are being restored.[3]

References[]

  1. ^ a b c Kalla-Bishop 1986, p. 49.
  2. ^ Cook & Hollingsworth 2003, p. 80.
  3. ^ "Vapore - 640". Photorail forum. Retrieved 5 December 2015.
  • Kalla-Bishop, P. M. (1986). Italian state railways steam locomotives : together with low-voltage direct current and three-phase motive power. Abingdon: Tourret Publishing. ISBN 0905878035.
  • Cook, Arthur; Hollingsworth, Brian (2003). The great book of trains : featuring 310 locomotives shown in more than 160 full-colour illustrations and 500 photographs. London: Salamander Books. ISBN 0861019199.
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