FS Class 640 II

For the first use (1905–1906) of FS Class 640, see FS Class 680.

FS Class 640

FS locomotive 640.143 in 2012

Type and origin
Power type	Steam
Builder	Berliner Maschinenbau (48), Ernesto Breda, (103) Costruzioni Meccaniche di Saronno (18), Gio. Ansaldo & C.
Build date	1907-1911
Total produced	173

Specifications
UIC class	1′C h2
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in) standard gauge
Leading dia.	960 mm (37.80 in)
Driver dia.	1,850 mm (72.83 in)
Length	9,670 mm (31 ft 8 ³⁄₄ in)
Axle load	14.7 t (14.5 long tons; 16.2 short tons)
Loco weight	54.5 t (53.6 long tons; 60.1 short tons)
Tender weight	35.3 t (34.7 long tons; 38.9 short tons)
Fuel type	Coal
Fuel capacity	6,000 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 pressure	12 kg/cm² (1.18 MPa; 171 psi)
Heating surface	108.5 m² (1,168 sq ft)
Superheater:
• Heating area	33.5 m² (361 sq ft)
Cylinders	Two
Cylinder size	540 mm × 700 mm (21.26 in × 27.56 in)
Valve gear	Walschaerts, Caprotti

Performance figures
Maximum speed	100 km/h (62 mph)
Power output	800 CV (588 kW; 789 hp)
Tractive effort	10,000 kgf (98.1 kN; 22,000 lbf)

Career
Preserved	15 rebuilt (from FS Class 630)

The Ferrovie dello Stato (FS; Italian State Railwayas) 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 Class 630, 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.

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, three (the 143, 148 and 091) are currently operational and available for heritage trains.^[3]

References

1 2 3 Kalla-Bishop 1986, p. 49.
↑ Cook & Hollingsworth 2003, p. 80.
↑ "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.

Classes of Ferrovie dello Stato locomotives

Steam

Tender locomotives	100 102 103 110^I 110^II 111 112 113 114 116 117 118 119^I 119^II 120 121 122 136 139 140 150 155 158 160 161 162 163 164 170 180 181^I 181^II 182^I 182^II 183 185 186 187 190 193 194 195 196 197 198 200 201 206 207 208 209 211 212 215 216 217 218 219 220 221 222 223 224 255 260 261 262 265 268 269 270 271 272 290 291 292 293 310 320 380 385 388 390 391 394 395 396 397 400 410 420 421 422 423 424 425 450 451 452 453 454 455 460 470 471 472 473 474 475 476 477 478 479 480 482 499^I 499^II 500 510 512 513 530 540^I 540^II 542 543 545 550 552 553 554 555 556 560 600 601 603 604 605 606 607 623 625 626 630 640^I 640^II 645 650 652 653 656 660 666 670 671 672 675 676 677 680 681 682 683^I 683^II 685 686 687 688 690^I 690^II 691 720 728 729 730 731 735 736 737 740 741^I 741^II 743^I 743^II 744 745 746 747^I 747^II 750

Tank locomotives	800^I 800^II 801 802^I 802^II 803^I 803^II 804 805 806 809 810^I 810^II 811 812 813 814 815^I 815^II 815^III 816 817 818 819 820^I 820^II 821^I 821^II 822 823 824 825 826^I 826^II 827 828^I 828^II 828^III 829 830^I 830^II 831 835 842 848 849 850^I 850^II 851 870 871 874^I 874^II 875 876 877 880^I 880^II 881 882 885 893 894 895 896^I 896^II 897 898 899^I 899^II 900 902 904 905 906 910 912 915 940 950 980 981 999

Narrow gauge locomotives	R.201 R.202 R.300 R.301 R.302 R.305 R.306 R.310 R.370 R.401 R.402 R.410 R.440 R.441 R.442 R.443 R.600 P U

Electric

Rechargeable battery	E.421

650 V DC Third rail	E.220 E.320 E.321 E.420 E.620

3,6 kV AC Three-Phase	E.330 E.331 E.332 E.333 E.360 E.380 E.390 E.430 E.431 E.432 E.550 E.551 E.552 E.554

10,6 kV AC Three-Phase	E.470 E.471 E.472 E.570

3 kV DC	E.321 E.322 E.323 E.324 E.326 E.400 E.402A E.402B E.403 E.404 E.405 E.412 E.414 E.424 E.428 E.434 E.444 E.444R E.447 E.453 E.454 E.464 E.621 E.625 E.626 E.632 E.633 E.636 E.645 E.646 E.652 E.655 E.656

25 kV AC	E.491 E.492

Diesel

Light shunters	206 207 208^I 208^II 209 210 211 R.212 213^I 213^II 214 215 216 218^I

Shunters	218^II 225 234 235 236 245 250 255

Heavy shunters	Ne 120 D.141 RD.142 D.143 D.145 D.146 D.147 356 372 Ne 700

Train locomotives	D.341 D.342 D.343 D.345 D.442 D.443 D.445 D.449 D.461

see also Category:Rolling stock of Italy

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