FS Class 735

FS locomotive 735.128 as preserved in the Pietrarsa railway museum

Type and origin
Power type	Steam
Builder	American Locomotive Company (115), Montreal Locomotive Works (285)
Build date	1917–1922
Total produced	400

Specifications
UIC class	1′D h2
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in) standard gauge
Leading dia.	840 mm (33.07 in)
Driver dia.	1,370 mm (53.94 in)
Length	10,595 mm (34 ft 9 ¹⁄₈ in)
Axle load	14.8 tonnes (14.6 long tons; 16.3 short tons)
Loco weight	63.1 tonnes (62.1 long tons; 69.6 short tons)
Tender weight	50.2 tonnes (49.4 long tons; 55.3 short tons)
Fuel type	Coal
Fuel capacity	6,000 kg (13,000 lb)
Water cap	22,300 litres (4,900 imp gal; 5,900 US gal)
Firebox: • Firegrate area	3.17 m² (34.1 sq ft)
Boiler pressure	12 kg/cm² (1.18 MPa; 171 psi)
Heating surface	162.07 m² (1,744.5 sq ft)
Superheater:
• Heating area	42.68 m² (459.4 sq ft)
Cylinders	540 mm × 700 mm (21.26 in × 27.56 in), two
Valve gear	Walschaerts

Performance figures
Maximum speed	65 km/h (40 mph)
Power output	1,080 CV (794 kW; 1,070 hp)
Tractive effort	14,700 kgf (144 kN; 32,400 lbf)

Career
Number in class	393

The Ferrovie dello Stato Italiane (FS; Italian State Railways) Class 735 (Italian: Gruppo 35) is a 2-8-0 'Consolidation' steam locomotive.

Design and construction

The Class 735 was designed as a response of the situation developed during the years of World War I; the Italian railways needed more locomotives for freight trains, but there was no possibility of building them at home or in war-ravaged Europe. It was therefore decided to have them built overseas.

Using the Class 740 design as a pattern (but allowing for alterations in order to avoid delays in the production),^[1] an order for 105 (later raised to 115) locomotives was given to Alco in 1916, and the following year they were completed, disassembled and sent by cargo ship to Italy (with only 108 reaching Italy, however, as an U-boat sank the ship carrying the remaining seven). A subsequent order for another 285 locomotives, with some minor improvements in the boiler, was given in 1918 to the Montreal Locomotive Works.

Their American origin showed in their being fitted with a Bissel truck instead of the Italian bogie widespread in Italy, and with the locomotives of the first batch having fireboxes made of steel rather than copper.

Operations

Nicknamed "Wilson" (in honour of US president Woodrow Wilson) throughout their career, the Class 735 locomotives proved very successful; they were considered by engineers to be somewhat more powerful than the 740 Class, although their consumes were accordingly higher. Pulling mainly freight trains but often also passenger trains, they operated until the 1960s, when mass withdrawals of the Class began, until the last one was retired in 1971.^[1]

Preservation

Two Class 735 locomotives survived into preservation, the 735.128, preserved as a static exhibit at the Pietrarsa railway museum, ahd the 735.155, in possession of the Museo Ferroviario Piemontese, awaiting restoration.

Trivia

One Class 735 locomotive prominently appeared in the 1965 film Von Ryan's Express, starring Frank Sinatra.

References

Wikimedia Commons has media related to FS 735.

1 2 Kalla-Bishop 1986, p. 67.

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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