# FS Class 910

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FS Class 910 RS Class 400 FS Class 910 Type and origin Power type Steam Builder Gio. Ansaldo & C. (19) Società Italiana Ernesto Breda (35) Build date 1905–1908 Total produced 54 Specifications Configuration: ​ • Whyte 2-6-2T • UIC 1′C1′ n2vt Gauge 1,435 mm (4 ft 8+1⁄2 in) Leading dia. 850 mm (2 ft 9+1⁄2 in) Driver dia. 1,510 mm (4 ft 11+1⁄2 in) Wheelbase: ​ • Axle spacing (Asymmetrical) 2,400 mm (7 ft 10+1⁄2 in) 1,900 mm (6 ft 2+3⁄4 in) 1,900 mm (6 ft 2+3⁄4 in) 2,300 mm (7 ft 6+1⁄2 in) • Engine 8,500 mm (27 ft 10+5⁄8 in) Length: ​ • Over headstocks 11,552 mm (37 ft 10+3⁄4 in) • Over buffers 12,752 mm (41 ft 10 in) Height 4,210 mm (13 ft 9+3⁄4 in) Axle load: ​ • Leading 11,700 kg (11.5 long tons; 12.9 short tons) • Coupled 14,500 kg (14.3 long tons; 16.0 short tons) • Trailing 11,700 kg (11.5 long tons; 12.9 short tons) Adhesive weight 43,500 kg (42.8 long tons; 48.0 short tons) Loco weight 63,400 kg (62.4 long tons; 69.9 short tons) 66,900 kg (65.8 long tons; 73.7 short tons) after modification Fuel type Coal Boiler: ​ • Pitch 2,710 mm (8 ft 10+3⁄4 in) Boiler pressure 13 kgf/cm2 (12.7 bar; 185 psi) Cylinders 1 high pressure 1 low pressure High-pressure cylinder 460 mm × 600 mm (18+1⁄8 in × 23+5⁄8 in) Low-pressure cylinder 700 mm × 600 mm (27+9⁄16 in × 23+5⁄8 in) Valve gear Walschaerts Performance figures Maximum speed 75 km/h (47 mph) Power output 690 CV (510 kW; 680 hp) Career Operators Rete Sicula Italian State Railways Yugoslav Railways Numbers RS: 401–406 FS 9101–9154 FS 910.001–910.054 JŽ 115.001–115.007 Retired 1950s

**FS Class 910** were [2-6-2](/source/2-6-2) [tank locomotives](/source/Tank_locomotive) designed by [Guglielmo Cappa](/source/Guglielmo_Cappa) for [Rete Sicula](/source/Rete_Sicula) where they were registered as RS Class 400. They were absorbed by [Italian State Railways](/source/Italian_State_Railways) (FS) in 1905 and became FS Class 910.

## History

With the conventions of 1885, [Rete Sicula](/source/Rete_Sicula) took over the lines of [Società per le Strade Ferrate Calabro-Sicule](/source/Societ%C3%A0_per_le_Strade_Ferrate_Calabro-Sicule) and had to face the problems of constructing new lines and introducing modern locomotives. The engineer [Guglielmo Cappa](/source/Guglielmo_Cappa) designed the Class 400 steam locomotives which were re-registered as FS Class 910 on nationalization in 1905. The locomotive was designed to tackle steeply-graded lines, such as [Messina](/source/Messina) - [Palermo](/source/Palermo) with its pass of the [Peloritani](/source/Peloritani) Mountains and its long tunnel. It also had to be suitable for minor local or commuter services and to have the characteristic of bidirectionality, to gain time at terminal stations by avoiding the need for turntables.

The choice was a 2-6-2T which allowed the same speed in both directions of travel. The first 19 locomotives were built by [Ansaldo](/source/Gio._Ansaldo_%26_C.) of [Sampierdarena](/source/Sampierdarena), while the remaining 35 were built by [Società Italiana Ernesto Breda](/source/Societ%C3%A0_Italiana_Ernesto_Breda) of [Milan](/source/Milan).[1] Deliveries took place during the passage of the Sicula Network to the FS. The first delivery was of 6 locomotives registered by the Sicula network as RS 401-406. Later deliveries were numbered in the FS 91xx series from the start. In 1906 a specimen was exhibited at the Milan Exposition. The entire group became concentrated in [Milan](/source/Milan) for suburban services and those in Sicily were transferred to Milan. Over the years, they underwent small changes and continued to perform good service in the locomotive depots of Milano Centrale and Pavia for the service on the lines from Milan to [Bergamo](/source/Bergamo), [Como](/source/Como), [Lecco](/source/Lecco) and [Voghera](/source/Voghera).

### Diesel conversion

In 1929 the 910.042 was experimentally converted to a [Diesel-Zarlatti locomotive](/source/Diesel-Zarlatti_locomotive). This had a [diesel engine](/source/Diesel_engine) and compressed-air transmission, using the original steam cylinders. It was not a great success and had no practical follow-up.[2]

### World War II

During [World War II](/source/World_War_II), some locomotives were used for operations in Yugoslavia and seven of them remained there permanently at the end of the war, incorporated by the Yugoslavian Railways (JŽ) as their class 115.

## Technical features

The locomotives used [saturated steam](/source/Saturated_steam) and [compound expansion](/source/Compound_locomotive). The high-pressure cylinder was on the left, with [piston valves](/source/Piston_valves), and the low-pressure cylinder was on the right, with a [slide valve](/source/Slide_valve). Outside [Walschaerts valve gear](/source/Walschaerts_valve_gear) was used.

The locomotive frame was carried on three coupled axles and two one-axle trucks, of the Adams type, at the two ends. This made the locomotive stable, even at high speeds, both in forward and reverse. The boiler had 222 fire tubes, increased to 226 in the second ordering series. Despite being a tank engine, the locomotive carried 3,000 kg (6,600 lb) of coal and 8,000 kg (18,000 lb) of water.

A modification carried out from the second series onwards was the increase in the diameter of the carrying wheels from 830 to 960 mm (33 to 38 in) and the replacement of the Nathan lubrication system with a Friedmann lubrication pump. The locomotive was equipped with a compressed air brake and a proportional brake. It was also equipped for steam heating of the train.

## Depot allocations

- Messina

- Milano

- Padova

- Milano Greco

- Venezia Mestre

- Livorno

- Voghera

- Brescia

- Lecco

## Preservation

Number 910.001 was restored and is at the [National Railway Museum of Pietrarsa](/source/National_Railway_Museum_of_Pietrarsa).

## References

1. **[^](#cite_ref-FOOTNOTEKalla-Bishop198696_1-0)** [Kalla-Bishop (1986)](#CITEREFKalla-Bishop1986), p. 96.

1. **[^](#cite_ref-2)** ["RISULTATI: delle prove preliminari eseguitecon la locomotiva " Diesel - Zarlatti "sulla Ferrovia Roma-Ostia"](http://www.trenidicarta.it/pdf/13/13637.pdf) [Results of the preliminary tests carried out with the "Diesel - Zarlatti" locomotive on the Rome-Ostia Railway] (PDF). *trenidicarta.it* (in Italian). Retrieved 23 October 2024.

- Kalla-Bishop, P. M. (1986). *Italian State Railways Steam Locomotives*. Abingdon: Tourret Publishing. pp. 95–97. [ISBN](/source/ISBN_(identifier)) [0-905878-03-5](https://en.wikipedia.org/wiki/Special:BookSources/0-905878-03-5).

## Further reading

- Giovanni Cornolò, L'ing. Guglielmo Cappa e le sue compound della "Sicula", in Mondo Ferroviario 87.

- Zeta-Zeta [Bruno Bonazzelli], L'album delle locomotive, in HO Rivarossi, 11 (1964), n. 63, pp. 20–21.

v t e Classes of Ferrovie dello Stato Italiane locomotives Steam Tender locomotives 100 102 103 110I 110II 111 112 113 114 116 117 118 119I 119II 120 121 122 136 139 140 150 155 158 160 161 162 163 164 170 180 181I 181II 182I 182II 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 499I 499II 500 510 512 513 530 540I 540II 542 543 545 550 552 553 554 555 556 560 600 601 603 604 605 606 607 623 625 626 630 640I 640II 645 650 652 653 656 660 666 670 671 672 675 676 677 680 681 682 683I 683II 685 686 687 688 690I 690II 691 720 728 729 730 731 735 736 737 740 741I 741II 743I 743II 744 745 746 747I 747II 750 Tank locomotives 800I 800II 801 802I 802II 803I 803II 804 805 806 809 810I 810II 811 812 813 814 815I 815II 815III 816 817 818 819 820I 820II 821I 821II 822 823 824 825 826I 826II 827 828I 828II 828III 829 830I 830II 831 835 842 848 849 850I 850II 851 870 871 874I 874II 875 876 877 880I 880II 881 882 885 893 894 895 896I 896II 897 898 899I 899II 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.640 E.645 E.646 E.652 E.655 E.656 25 kV AC E.491 E.492 Diesel Light shunters 206 207 208I 208II 209 210 211 R.212 213I 213II 214 215 216 218I Shunters 218II 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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Adapted from the Wikipedia article [FS Class 910](https://en.wikipedia.org/wiki/FS_Class_910) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/FS_Class_910?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.