FS Class E.331

4 ft 8+1⁄2 in) standard gaugeLeading dia.960 mm (38 in)Driver dia.1,630 mm (64 in)Trailing dia.960 mm (38 in)Loco weight92 tonnes (91 long tons; 101 short tons)Electric system/sThree-phase overhead line
3.6 kV, 16.7 Hz

Performance figures
Maximum speed	100 km/h (62 mph)
Power output	2,000 kW (2,700 hp)

Career
Operators	FS

FS Class E.331 was a class of three-phase electric locomotives of the Italian State Railways. Eighteen of these 2′C2′ locomotives were built between 1914 and 1919 by Breda and Brown-Boveri.

Overview

Eighteen of these locomotives were built by Breda, with electrical parts by Brown-Boveri, between 1914 and 1919. The class had the same pole-changing system as the E.330 which allowed an increase in the number of economic speeds to four. Until a few years earlier, only two speeds could be obtained with the arrangement of cascade or parallel traction motor connections. In the E.331, a further two economic speeds could be obtained by changing the number of poles on the traction motors. One of the limitations of the machine, and the source of numerous failures, was the type of rotary switch used to vary the number of poles. Current was picked up from the two-wire overhead line by two pantographs, both continuously in use. The locomotive was built on a rigid frame, with three coupled axles driven by two jackshafts connected to the motors by inclined connecting rods. The front and rear bogies had smaller diameter wheels, as was usual for the locomotives of the time.

Service

Class E.331 locomotives were used between Turin and Bussoleno, on the Frejus line. The 2′C2′ machines, with 100 km/h (62 mph) maximum speed and power of about 2,000 kW (2,700 hp), were at their ease, especially on the flat or on gentle gradients.

References

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.640 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