FS Class 740

FS locomotive 740.108 in 2005

Type and origin
Power type	Steam
Builder	Gio. Ansaldo & C., Ernesto Breda, Officine Meccaniche di Saronno, Officine Meccaniche, Officine Meccaniche e Navali, Henschel & Sohn
Build date	1911–1923
Total produced	470

Specifications
UIC class	1′D h2
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in) standard gauge
Leading dia.	860 mm (33.86 in)
Driver dia.	1,370 mm (53.94 in)
Length	11,040 mm (36 ft 2 ⁵⁄₈ in)
Axle load	14.1 tonnes (13.9 long tons; 15.5 short tons)
Loco weight	66.5 tonnes (65.4 long tons; 73.3 short tons)
Tender weight	Six-wheel tender: 31.9 tonnes (31.4 long tons; 35.2 short tons) Bogie tender: 49.6 tonnes (48.8 long tons; 54.7 short tons)
Tender type	Three-axle or bogie
Fuel type	Coal
Fuel capacity	6,000 kg (13,000 lb)
Water cap	Bogie tender: 22,000 litres (4,800 imp gal; 5,800 US gal)
Firebox: • Firegrate area	2.8 m² (30 sq ft)
Boiler pressure	12 kg/cm² (1.18 MPa; 171 psi)
Heating surface	176.04 m² (1,894.9 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 or Caprotti

Performance figures
Maximum speed	65 km/h (40 mph)
Power output	980 CV (721 kW; 967 hp)
Tractive effort	14,700 kgf (144 kN; 32,400 lbf)

The Ferrovie dello Stato (FS; Italian State Railways) Class 740 (Italian: Gruppo 740) is a class of 2-8-0 'Consolidation' steam locomotives.

Design and construction

The FS Class 740 were designed as the simple expansion and superheated version of the earlier FS Class 730; after the success of the FS Class 640. The first locomotives were built in 1911, and the production continued (with a long interruption caused by World War I) throughout 1923; in total, 470 were built, making the Class 740 the most numerous locomotive to be built for the Ferrovie dello Stato. The first locomotives were built with right-hand drive, but from 740.204 this was changed to left-hand drive; some of them had a six-wheels tender, while others had a bogie tender with higher water capacity.^[1]

Operations

Built for heavy freight work, the Class 740 saw service on the whole FS network, with virtually any train shed having had some of them assigned to it at some point; other than freight trains, they were also usually employed for passenger services on secondary lines. Having been built for wide route availability (and therefore requiring a low axle load), they are generally considered successful locomotives, well-suited for the role they were built for, although some have criticized their rather poor steaming; although their official top speed was set at 65 km/h (40 mph), several locomotives have proven to be able to reach higher speeds, around 80 km/h (50 mph).

The Class 740 remained in active service until the end of regular Italian steam, in the 1970s; some of the class were still assigned to various sheds as reserves in the early 1990s.^[2]

Experiments and conversions

Caprotti valve gear

In 1921 locomotive 740.324 became the first FS locomotive to be fitted experimentally with Caprotti valve gear; the results were satisfactory, and locomotives 740.440–740.445 were modified during construction with the new valve gear and were classified in the separate Class 741, to be renumbered in 1930 as 740.691-697. An improved valve gear was fitted in 1932 to 740.352, which was renumbered 740.852; the valve gear was replaced by standard Walschaerts valve gear in 1955, and the remaining locomotives with Caprotti valve gear (which, although more efficient, required more refined maintenance) were withdrawn by the 1960s.

Franco-Crosti locomotives

In 1942 five 740 (numbers 339, 367, 392, 396 and 405) were rebuilt with a Franco-Crosti boiler, and fitted with a streamlined casing (more for aesthetical reasons than for any aerodynamic advantages). In 1951 these locomotives (with the casing removed) were renumbered into the FS Class 743, and 88 more were rebuilt until 1953. A modified version, with a single pre-heater under the boiler (instead of two placed alongside it), was classified as FS Class 741, and 81 of them were rebuilt between 1958 and 1960.

Preservation

Forty-nine Class 740 locomotives have survived into preservation. Five of them (the 740.038, 244, 293, 409 and 423) are currently operational and available for heritage trains.^[3]

References

Wikimedia Commons has media related to FS 740.

↑ Cornolò 2014, pp. 376–379.
↑ Cornolò 2014, pp. 383–384.
↑ "Vapore - 740". Photorail forum. Retrieved 5 December 2015.

Cornolò, Giovanni (July 2014). "Locomotive a vapore". TuttoTreno (3).

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

This article is issued from Wikipedia - version of the 9/6/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.