FS Class E.632

FS class E.632

E.632 in the original livery

Type and origin
Power type	Electric
Build date	1982-1987

Specifications
UIC class	B-B-B
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in) standard gauge
Wheel diameter	1.040 m (40.94 in)
Wheelbase	12.650 m (41 ft 6 in) between bogie pivots 2.150 m (84.65 in) between axles of each bogie
Length	17.800 m (58 ft 4 ³⁄₄ in)
Width	3.000 m (9 ft 10 ¹⁄₈ in)
Height	4.310 m (14 ft 1 ⁵⁄₈ in)
Loco weight	103 t (101 long tons; 114 short tons)
Electric system(s)	3,000 V DC Catenary
Current collection	Pantograph
Traction motors	DC series
Transmission	36/64 gear ratio
Loco brake	Oerlikon FV4E
Safety systems	RSC4; SCMT

Performance figures
Maximum speed	160 km/h (99 mph)
Power output	4,200 kW (5,600 hp)

Career
Operators	FS Trenitalia
Number in class	65^[1]
Nicknames	"Tigre", "Tigrone" (E652), "Tigrotto" (E620 FNM)
First run	1982
Disposition	In service

FS class E.633

An E.633 with a cargo train in Santhià, 2006.

Type and origin
Power type	Electric
Build date	1979-1987

Specifications
UIC class	B-B-B
Wheel diameter	1.040 m (40.94 in)
Wheelbase	12.650 m (41 ft 6 in) between bogie pivots 2.150 m (84.65 in) between axles of each bogie
Length	17.800 m (58 ft 4 ³⁄₄ in)
Width	3.000 m (9 ft 10 ¹⁄₈ in)
Height	4.310 m (14 ft 1 ⁵⁄₈ in)
Loco weight	103 t (101 long tons; 114 short tons)
Electric system(s)	3,000 V DC Catenary
Current collection	Pantograph
Traction motors	DC series
Transmission	29/64 gear ratio

Performance figures
Maximum speed	130 km/h (81 mph)
Power output	4,200 kW (5,600 hp)

Career
Operators	FS Trenitalia
Number in class	147^[2]
First run	1979
Disposition	In service

The FS E.632 and E.633 are two classes of Italian railways electric locomotives. They were introduced in the course of the 1980s.

The locomotives are nicknamed Tigre ("tiger").

History

The E.632/E.633 were the first Italian locomotives to be provided with electronic traction control system, on the basis of the experiments made with the E.444.005 test locomotive. They were designed to fulfill a requirement from the Ferrovie dello Stato (or FS, then the quasi-monopolist of Italian railways) for a new locomotive to be used with medium-weight passenger trains and a similar one for cargo services on steep lines.

The first unit ran on October 11, 1979. After a troublesome program of tests with the first five prototypes, a first order for 90 engines (75 E.633, the cargo version, and 15 E.632) was issued. Regular services began in 1983 in northern Italy. Once the teething problems were solved, the class proved highly successful and reliable.

Technical details

Differently from many of the previous FS classes, the E.632/633 carbody is not articulated. The power plant is made of three 1,635 kilowatts (2,193 hp) FS T850 DC motors, mounted on single-engined bogies, each with two axles. Each motor is provided with a three-frequency chopper which takes place of the resistor network used on older Italian locomotives (rheostat). This allow the motors to run for an indefinite period of time without risks.
The two classes have different transmission gear: 36/64 for the E.632, with a maximum speed of 160 km/h (99 mph), and 29/64, with a maximum speed of only 130 km/h (81 mph) but a higher tractive effort. Since the beginning, all units were provided with the standard 78-wire cable for coupling with driving passenger cars, useful in the formation of commuter push-pull trains. 40 E633s were also fitted with a 13-wire ZDS cable (comando multiplo) in order to allow hauling with multiple units by only one engine crew, from the "master" locomotive.

The locomotives have, in addition to pneumatic brakes, a rheostatic braking system. The braking rheostat is placed on the roof, between the pantographs. Curiously, the air brake employs a mixed shoes-disc system (one shoe per wheel and one disc per axle), due to space issues about the motor placement; also, E.632 have 10 in (254 mm) brake cylinders, while E.633 8 in (203.2 mm). The chopper regulation and the rheostatic braking allow the driver to set an automatic speed control; the locomotive will try to keep the set speed by electrically braking or by tractioning if needed. This group has been the first in Italy that allowed this.

Related development

The E.632/633 was used as base for the development of the E.491/492 locomotives for use with 25 kV ac lines in Sardinia, which however were never mass built.

Class E.652 is a type of locomotive derived from E.633/2. They unite the acceleration and hauling capacities of E.633 with the speed of E.632 (160 km/h or 99 mph); externally they are almost identical to E.632/3, but the electrical part is very different. The first unit was built in 1989, and have been the first Italian locomotive with electronic board diagnostics and relative screen on the driver's desk. At this time, they are all assigned to the Global Logistic (Cargo) division of Trenitalia, hauling freight trains, though sometimes can be seen hauling passenger trains (often long-range ones) on rescue services due to failures.

The B-B locomotive E.620 of Ferrovie Nord Milano (nicknamed Tigrotto) is a two-bogie version of the class.

Footnotes

↑ Plus one prototype
↑ Plus 4 prototypes

External links

Wikimedia Commons has media related to FS E.632.

Wikimedia Commons has media related to FS E.633.

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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