FS Class 940

FS locomotive 940.002 preserved at Piazza al Serchio

Type and origin
Power type	Steam
Builder	Officine Meccaniche, Reggiane, Officine Meccaniche e Navali di Napoli
Build date	1922–1924
Total produced	53

Specifications
Configuration	2-8-2T
UIC class	1′D1′ h2t
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in)
Leading dia.	860 mm (33.86 in)
Driver dia.	1,370 mm (53.94 in)
Trailing dia.	1,110 mm (43.70 in)
Length	13,178 mm (43 ft 2.8 in)
Axle load	15.4 t
Adhesive weight	61.6 tonnes (60.6 long tons; 67.9 short tons)
Loco weight	87.3 tonnes (85.9 long tons; 96.2 short tons)
Fuel type	Coal
Fuel capacity	3,500 kg (7,700 lb)
Water cap	10,000 litres (2,200 imp gal; 2,600 US gal)
Firebox: • Firegrate area	2.8 m² (30 sq ft)
Boiler pressure	12 kg/cm² (1.18 MPa; 171 psi)
Heating surface	152.92 m² (1,646.0 sq ft)
Superheater:
• Heating area	41.23 m² (443.8 sq ft)
Cylinders	Two, outside
Cylinder size	540 mm × 700 mm (21.26 in × 27.56 in)
Valve gear	Walschaerts

Performance figures
Maximum speed	65 km/h (40 mph)
Power output	980 PS (967 hp; 721 kW)
Tractive effort	13,500 kgf (132 kN; 29,800 lbf)

The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 940 (Italian: Gruppo 940) is a 2-8-2 steam tank locomotive, derived from the Class 740 tender locomotive.

Design

The Class 940 was designed for the Appennine mountains railways, and especially for the Rome-Sulmona-Pescara line, an important coast-to-coast railway that presented steep gradients (up to 2.7%); until then those had been served by 0-6-0 locomotives such as the FS Class 851, that had become inadequate for the increasing needs. Therefore, it was decided to build a locomotive with eight driving wheels, by adapting the frames, the boiler and the engine of the Class 740 to a tank design, also adding a trailing wheel to the wheelbase to enable the new design to run well backwards as well as forwards.

The locomotives were built from 1922 to 1924 by the Officine Meccaniche, Reggiane and the Officine Meccaniche e Navali di Napoli, for a total of 50.^[1]^[2]

Service and modifications

Initially, most of the class was allocated to the Sulmona shed for service on the trans-appennine railway; after World War II (in which four locomotives ended up remaining in Yugoslavian territory, and being taken up by the Yugoslav Railways as JŽ 118 001-4), the Class was dispersed in many sheds throughout Italy. Since 1968 improved draughting and a larger chimney were fitted.

In 1951 three locomotives identical to the Class 940 but built in 1924 for the Ferrovie Elettriche Biellesi, numbered 941–943, were taken over by the FS, when the company was absorbed, and were given the running numbers from 940.051 to 940.053, therefore bringing to 53 the nominal total for the class.

The Class 940 was a successful design, that remained in service till the end of regular steam services on the FS network, mostly for freight service but also for passenger trains and heavy shunting duties.^[3]^[4]

Preservation

Eighteen Class 940 survived into preservation; currently, only the 041 is operational and available for heritage trains, while others (such as the 022 and the 036) are undergoing maintenance.^[5]

References

Wikimedia Commons has media related to FS 940.

↑ Cornolò, p. 532-3
↑ Kalla-Bishop, p. 96
↑ Cornolò, p. 533-7
↑ Kalla-Bishop, ibidem
↑ "Vapore - 940". Photorail forum. Retrieved 5 December 2015.

Cornolò, Giovanni (October 2014). "Locomotive a vapore". TuttoTreno (4).
Kalla-Bishop, P.M. (1986). Italian state railways steam locomotives : together with low-voltage direct current and three-phase motive power. Abingdon: Tourret. ISBN 0905878035.

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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