570:
1539:
656:
42:
1533:
1527:
1521:
548:, was found inadequate to haul the longer, heavier express trains (24-26 coaches) that were becoming the mainstay of the Indian Railways network. IR/RDSO had realized that the reason for the WAP-1’s performance problems were the low-powered 770 hp Alstom TAO 659 traction motors. These were previously used with for the
601:
However, in the face of the advent of three-phase AC traction motors, IGBT-controlled AC drives, and full computer controls, the DC traction motors was getting increasingly outdated. As a result, after over 20 years, production of the WAP-4 locomotives ceased on
November 1, 2015, with the 776th unit,
560:
It also was among the first locomotives to get a microprocessor-based control and fault diagnostics system. To accommodate the heavier
Hitachi motors without increasing its 112t overall weight, the WAP-4 was made substantially lighter by the widespread use of aluminum materials in construction. The
585:
The loco has a streamlined twin cab carbody design, with top-mounted headlamps. The first 150 or so units had the headlamp mounted at waist level, with the lights being mounted in a protruding nacelle. Later on the headlamps were placed in a recessed nacelle, and from road # 22573 onward, the
556:
classes but were too underpowered for modern requirements. At that time, new 840 hp
Hitachi 15250 traction motors which had been adopted for use on newer WAG-5s was showing promise. So, these traction motors were adopted on to WAP-1s Flex-icoil Mark I fabricated bogies, and with a new
586:
headlamps were moved to the top. Newer locos also feature larger windshields, more spacious driver cabin with bucket type seats and ergonomic controls. The control panel also features a mix of digital and analog displays in newer units (all analog display in older versions).
716:
All WAP-4s are painted in the same red-black with a yellow/cream band livery, though the shade of the red will differ from shed to shed, from the blazing crimson red of
Santragachi SRC/SER to the orange of Erode ED/SR.BZA/SCR painted with navy blue livery recently
517:, AC Current (A), Passenger traffic (P) locomotive, 4th generation (4). They entered service in late 1994. A total of 778 WAP-4 were built at CLW between 1993 and 2015, which made them the most numerous class of mainline electric passenger locomotive until the
528:. Despite the introduction of more modern types of locomotives like WAP-7, a significant number are still in use, both in mainline duties. Production of this class was halted in December 2015 with locomotive number 25051 being the last unit to be rolled out.
569:
610:
The WAP-4s were developed at the same time IR gave procurement orders for WAP-5 locomotives, as they were meant for more general duties of hauling 24-coach expresses while WAP-5 were specially meant for high-speed operations.
1288:
531:
As of
September 2022, all locomotives except those lost in accidents still retain "operational status" on the mainline as WAP-4, with further examples having been converted from WAP-6.
524:
The WAP-4 is one of the most successful locomotives of Indian
Railways serving passenger trains for over 29 years. This class provided the basic design for other locomotives like the
618:(MU) operations. This configuration of MU-fitted WAP-4 locos are being used to haul medium tonnage faster freight trains across IR. The different locomotive sheds of WAP-4 are
594:
The first WAP-4 unit, #22201 rolled out from CLW on April 25, 1994. They looked exactly like the WAP-1, even sporting the same livery. From 2000, newer versions with many
139:
351:
Slip control, Over voltage relay, Main overload relay, Earth Fault Relay, Low
Pressure Governor, Brake Cylinder Cutoff Valve, Train parting alarms and No OHE volt relay
2137:
1281:
677:
1204:
598:
design cues like square type windscreens ,twin-beam headlights, speed recorders and some changes to the control electronics had been rolled out recently.
1112:
1274:
2122:
2025:
1859:
1753:
1075:
2142:
2001:
966:
631:
1547:
619:
561:
underframe of WAP-4 is narrower and lighter and also completely different from that of the WAP-1 to enable it to handle higher loads.
1481:
1476:
1248:
793:
703:
1981:
1667:
1663:
1659:
1655:
837:
289:
1910:
1884:
1879:
2097:
2068:
2052:
2047:
2042:
2011:
2006:
1976:
1693:
1683:
1625:
1588:
1582:
1572:
948:
681:
2127:
1996:
1991:
1986:
1971:
1966:
1961:
1956:
1951:
1935:
1930:
1925:
1915:
1905:
1889:
1874:
1845:
1840:
1824:
1819:
1814:
1809:
1793:
1788:
1783:
1778:
1773:
1768:
1739:
1734:
1729:
1724:
1719:
1714:
1709:
1688:
1677:
1673:
1638:
1634:
1630:
1620:
1604:
1599:
1594:
1577:
1567:
1562:
904:
595:
553:
549:
545:
525:
518:
506:
72:
806:
749:
1450:
1445:
1440:
1435:
824:
615:
614:
Recently as per directive received from
Railway Board, all the loco sheds holding WAP-4 type locomotives have started
2132:
1506:
1501:
1496:
1491:
1486:
1471:
1466:
1419:
1409:
1389:
1384:
1379:
1374:
1369:
1348:
1343:
1338:
1328:
1323:
984:
961:
943:
886:
868:
855:
850:
767:
2082:
1183:
917:
873:
788:
1414:
1404:
1399:
1394:
1353:
1333:
1538:
1010:
666:
1297:
1050:
997:
930:
685:
670:
514:
284:
154:
1086:
899:
819:
128:
1300:
1045:
979:
762:
744:
1154:
502:
499:
1133:
1254:
1244:
1165:
1134:"Procedure for Welding of Centre Pivot Pin to The Underframe of WAP-4 & WAG-7 Locomotives"
331:
306:
301:
1308:
1040:
510:
430:
394:
313:
173:
Co-Co
Flexicoil Mark 90 cast bogies; primary and secondary wheel springs with bolsters
2116:
338:
326:
294:
1218:
1266:
655:
623:
149:
76:
1169:
1532:
1258:
266:
41:
1238:
639:
1526:
318:
1520:
17:
635:
1184:"MINUTES OF XXXVII MAINTENANCE STUDY GROUP (ELECTRIC LOCO) MEETING"
557:
indigenously designed 5400 kVA transformer and silicon rectifiers.
1205:"Waltair Division to use WAP-4 model locos for freight operations"
627:
471:
168:
80:
1155:"Study on Bogie and Suspension System of an Electric Locomotive"
496:
1270:
649:
544:
The WAP-4 class was developed after its predecessor, the
1243:. Harrow, Middlesex: The Continental Railway Circle.
2090:
2081:
2061:
2035:
2024:
1944:
1898:
1867:
1858:
1833:
1802:
1761:
1752:
1702:
1648:
1613:
1555:
1546:
1459:
1428:
1362:
1316:
1307:
477:
466:
436:
426:
421:
405:
393:
385:
376:
368:
363:
347:
337:
325:
312:
300:
283:
275:
265:
247:
225:
203:
177:
167:
148:
137:
126:
117:
112:
94:
86:
68:
60:
55:
34:
27:Indian Railway passenger class electric locomotive
409:30,800 kgf (302 kN; 68,000 lbf)
199:Full worn: 1,016 mm (3 ft 4 in)
1282:
1024:Total locomotives active as of September 2024
8:
1240:Indian Locomotives: Part 4 – 1941–1990
684:. Unsourced material may be challenged and
2087:
2032:
1864:
1758:
1552:
1313:
1289:
1275:
1267:
418:
360:
109:
52:
704:Learn how and when to remove this message
100:778 as of August 2016 (Production ceased)
724:
568:
181:New: 1,092 mm (3 ft 7 in)
1067:
2138:Railway locomotives introduced in 1994
31:
7:
682:adding citations to reliable sources
183:Half worn: 1,055 mm (3 ft
291:25 kV 50 Hz AC
25:
1085:. 29 January 2010. Archived from
279:116,000 kg (256,000 lb)
1537:
1531:
1525:
1519:
1111:Maharajpur, Gwalior (May 2002).
654:
46:Howrah based WAP-4 at Howrah Jn.
40:
271:18,800 kg (41,400 lb)
1083:www.rdso.indianrailways.gov.in
505:that was developed in 1993 by
1:
2123:Electric locomotives of India
507:Chittaranjan Locomotive Works
389:5,050 hp (3,766 kW)
73:Chittaranjan Locomotive Works
513:. The model name stands for
491:The Indian locomotive class
2143:5 ft 6 in gauge locomotives
1113:"FLEXICOIL BOGIES MARK - I"
372:140 km/h (87 mph)
2159:
1191:rdso.indianrailways.gov.in
1141:rdso.indianrailways.gov.in
1120:rdso.indianrailways.gov.in
602:#25051, being rolled out.
207:18.794 m (61 ft
1517:
1022:
978:
942:
898:
867:
849:
818:
787:
766:
761:
743:
417:
359:
251:4.272 m (14 ft
229:3.179 m (10 ft
108:
90:1993 till 2 December 2015
51:
39:
794:Pt. Deen Dayal Upadhyaya
156:5 ft 6 in
1051:Rail transport in India
386: • Continuous
582:
1237:Hughes, Hugh (1996).
962:South Eastern Railway
944:South Central Railway
869:North Eastern Railway
851:North Central Railway
572:
406: • Starting
2128:25 kV AC locomotives
1460:IGR standard designs
1429:World War II designs
1301:locomotives of India
1207:. 14 September 2020.
1046:Locomotives of India
789:East Central Railway
678:improve this section
503:electric locomotives
726:
581:) older series unit
577:) newer loco with (
364:Performance figures
1725:WDS-4 (4A, 4B, 4D)
1193:. 24–25 July 2015.
725:
583:
2133:Co-Co locomotives
2110:
2109:
2106:
2105:
2077:
2076:
2020:
2019:
1854:
1853:
1748:
1747:
1515:
1514:
1032:
1031:
714:
713:
706:
495:is a class of 25
489:
488:
485:
484:
413:
412:
355:
354:
302:Current pickup(s)
285:Electric system/s
104:
103:
16:(Redirected from
2150:
2088:
2033:
2026:Dual (AC and DC)
1865:
1759:
1553:
1541:
1535:
1529:
1523:
1314:
1291:
1284:
1277:
1268:
1262:
1223:
1222:
1215:
1209:
1208:
1201:
1195:
1194:
1188:
1180:
1174:
1173:
1159:
1151:
1145:
1144:
1138:
1130:
1124:
1123:
1117:
1108:
1102:
1101:
1099:
1097:
1091:
1080:
1072:
900:Southern Railway
820:Northern Railway
727:
721:Locomotive sheds
709:
702:
698:
695:
689:
658:
650:
419:
361:
292:
260:
259:
255:
242:
241:
237:
234:
220:
219:
215:
212:
196:
195:
191:
188:
162:
157:
110:
97:
53:
44:
32:
21:
2158:
2157:
2153:
2152:
2151:
2149:
2148:
2147:
2113:
2112:
2111:
2102:
2073:
2057:
2027:
2016:
1940:
1894:
1850:
1829:
1798:
1744:
1698:
1644:
1609:
1542:
1536:
1530:
1524:
1511:
1455:
1424:
1358:
1303:
1295:
1265:
1251:
1236:
1232:
1227:
1226:
1217:
1216:
1212:
1203:
1202:
1198:
1186:
1182:
1181:
1177:
1157:
1153:
1152:
1148:
1143:. October 2001.
1136:
1132:
1131:
1127:
1115:
1110:
1109:
1105:
1095:
1093:
1092:on 29 July 2022
1089:
1078:
1076:"RDSO document"
1074:
1073:
1069:
1064:
1059:
1041:Indian Railways
1037:
980:Western Railway
763:Eastern Railway
745:Central Railway
723:
710:
699:
693:
690:
675:
659:
648:
608:
592:
567:
542:
537:
515:broad gauge (W)
511:Indian Railways
431:Indian Railways
398:
395:Tractive effort
378:
314:Traction motors
290:
257:
253:
252:
239:
235:
232:
230:
217:
213:
210:
208:
198:
193:
189:
186:
184:
182:
160:
155:
119:
95:
56:Type and origin
47:
28:
23:
22:
15:
12:
11:
5:
2156:
2154:
2146:
2145:
2140:
2135:
2130:
2125:
2115:
2114:
2108:
2107:
2104:
2103:
2101:
2100:
2094:
2092:
2085:
2079:
2078:
2075:
2074:
2072:
2071:
2065:
2063:
2059:
2058:
2056:
2055:
2050:
2045:
2039:
2037:
2030:
2022:
2021:
2018:
2017:
2015:
2014:
2009:
2004:
1999:
1994:
1989:
1984:
1979:
1974:
1969:
1964:
1959:
1954:
1948:
1946:
1942:
1941:
1939:
1938:
1933:
1928:
1923:
1918:
1913:
1908:
1902:
1900:
1896:
1895:
1893:
1892:
1887:
1882:
1877:
1871:
1869:
1862:
1856:
1855:
1852:
1851:
1849:
1848:
1843:
1837:
1835:
1831:
1830:
1828:
1827:
1822:
1817:
1812:
1806:
1804:
1800:
1799:
1797:
1796:
1791:
1786:
1781:
1776:
1771:
1765:
1763:
1756:
1750:
1749:
1746:
1745:
1743:
1742:
1737:
1732:
1727:
1722:
1717:
1712:
1706:
1704:
1700:
1699:
1697:
1696:
1691:
1686:
1681:
1671:
1652:
1650:
1646:
1645:
1643:
1642:
1628:
1623:
1617:
1615:
1611:
1610:
1608:
1607:
1602:
1597:
1592:
1586:
1580:
1575:
1570:
1565:
1559:
1557:
1550:
1544:
1543:
1518:
1516:
1513:
1512:
1510:
1509:
1504:
1499:
1494:
1489:
1484:
1479:
1474:
1469:
1463:
1461:
1457:
1456:
1454:
1453:
1448:
1443:
1438:
1432:
1430:
1426:
1425:
1423:
1422:
1417:
1412:
1407:
1402:
1397:
1392:
1387:
1382:
1377:
1372:
1366:
1364:
1360:
1359:
1357:
1356:
1351:
1346:
1341:
1336:
1331:
1326:
1320:
1318:
1311:
1305:
1304:
1296:
1294:
1293:
1286:
1279:
1271:
1264:
1263:
1249:
1233:
1231:
1228:
1225:
1224:
1210:
1196:
1175:
1164:. April 2014.
1146:
1125:
1103:
1066:
1065:
1063:
1060:
1058:
1055:
1054:
1053:
1048:
1043:
1036:
1033:
1030:
1029:
1026:
1020:
1019:
1016:
1013:
1007:
1006:
1003:
1000:
994:
993:
990:
987:
982:
976:
975:
972:
969:
964:
958:
957:
954:
951:
946:
940:
939:
936:
933:
927:
926:
923:
920:
914:
913:
910:
907:
902:
896:
895:
892:
889:
883:
882:
879:
876:
871:
865:
864:
861:
858:
853:
847:
846:
843:
840:
834:
833:
830:
827:
822:
816:
815:
812:
809:
803:
802:
799:
796:
791:
785:
784:
781:
777:
776:
773:
770:
765:
759:
758:
755:
752:
747:
741:
740:
737:
734:
731:
722:
719:
712:
711:
662:
660:
653:
647:
644:
607:
604:
591:
588:
566:
563:
541:
538:
536:
533:
487:
486:
483:
482:
479:
475:
474:
468:
464:
463:
438:
434:
433:
428:
424:
423:
415:
414:
411:
410:
407:
403:
402:
399:
391:
390:
387:
383:
382:
379:
374:
373:
370:
366:
365:
357:
356:
353:
352:
349:
348:Safety systems
345:
344:
341:
335:
334:
329:
323:
322:
316:
310:
309:
304:
298:
297:
287:
281:
280:
277:
273:
272:
269:
263:
262:
249:
245:
244:
227:
223:
222:
205:
201:
200:
179:
178:Wheel diameter
175:
174:
171:
165:
164:
152:
146:
145:
142:
135:
134:
131:
124:
123:
120:
118:Configuration:
115:
114:
113:Specifications
106:
105:
102:
101:
98:
96:Total produced
92:
91:
88:
84:
83:
70:
66:
65:
62:
58:
57:
49:
48:
45:
37:
36:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
2155:
2144:
2141:
2139:
2136:
2134:
2131:
2129:
2126:
2124:
2121:
2120:
2118:
2099:
2096:
2095:
2093:
2089:
2086:
2084:
2080:
2070:
2067:
2066:
2064:
2060:
2054:
2051:
2049:
2046:
2044:
2041:
2040:
2038:
2034:
2031:
2029:
2023:
2013:
2010:
2008:
2005:
2003:
2000:
1998:
1995:
1993:
1990:
1988:
1985:
1983:
1980:
1978:
1975:
1973:
1970:
1968:
1965:
1963:
1960:
1958:
1955:
1953:
1950:
1949:
1947:
1943:
1937:
1934:
1932:
1929:
1927:
1924:
1922:
1919:
1917:
1914:
1912:
1909:
1907:
1904:
1903:
1901:
1897:
1891:
1888:
1886:
1883:
1881:
1878:
1876:
1873:
1872:
1870:
1866:
1863:
1861:
1857:
1847:
1844:
1842:
1839:
1838:
1836:
1832:
1826:
1823:
1821:
1818:
1816:
1813:
1811:
1808:
1807:
1805:
1801:
1795:
1792:
1790:
1787:
1785:
1782:
1780:
1777:
1775:
1772:
1770:
1767:
1766:
1764:
1760:
1757:
1755:
1751:
1741:
1738:
1736:
1733:
1731:
1728:
1726:
1723:
1721:
1718:
1716:
1713:
1711:
1708:
1707:
1705:
1701:
1695:
1692:
1690:
1687:
1685:
1682:
1679:
1675:
1672:
1669:
1665:
1661:
1657:
1654:
1653:
1651:
1647:
1640:
1636:
1632:
1629:
1627:
1624:
1622:
1619:
1618:
1616:
1612:
1606:
1603:
1601:
1598:
1596:
1593:
1590:
1587:
1584:
1581:
1579:
1576:
1574:
1571:
1569:
1566:
1564:
1561:
1560:
1558:
1554:
1551:
1549:
1545:
1540:
1534:
1528:
1522:
1508:
1505:
1503:
1500:
1498:
1495:
1493:
1490:
1488:
1485:
1483:
1480:
1478:
1475:
1473:
1470:
1468:
1465:
1464:
1462:
1458:
1452:
1449:
1447:
1444:
1442:
1439:
1437:
1434:
1433:
1431:
1427:
1421:
1418:
1416:
1413:
1411:
1408:
1406:
1403:
1401:
1398:
1396:
1393:
1391:
1388:
1386:
1383:
1381:
1378:
1376:
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663:This section
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616:multiple unit
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377:Power output:
375:
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369:Maximum speed
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161:1,676 mm
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138: •
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19:
2002:WAGC3/WAG-10
1920:
1591:(3B, 3E, 3F)
1317:BESA designs
1239:
1230:Bibliography
1213:
1199:
1190:
1178:
1161:
1149:
1140:
1128:
1119:
1106:
1096:12 September
1094:. Retrieved
1087:the original
1082:
1070:
1023:
715:
700:
691:
676:Please help
664:
613:
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492:
490:
460:
456:
452:
448:
444:
440:
339:Train brakes
29:
1860:AC electric
1754:DC electric
1363:IRS designs
1298:Broad-gauge
967:Santragachi
825:Tughlakabad
694:August 2024
632:Mughalsarai
624:Santragachi
540:Development
478:Disposition
461:25000-25051
276:Loco weight
77:West Bengal
2117:Categories
2036:Mixed type
1868:Mixed type
1762:Mixed type
1556:Mixed type
1057:References
949:Vijayawada
887:Izzatnagar
807:Samastipur
733:Shed Name
590:Production
327:Loco brake
307:Pantograph
87:Build date
61:Power type
2091:Passenger
2083:Dual mode
2048:WCAM-2/2P
1982:WAG-6B/6C
1899:Passenger
1803:Passenger
1614:Passenger
1482:WL (1955)
1477:WL (1939)
1219:"e-Locos"
1170:2249-6645
905:Arakkonam
874:Gorakhpur
739:Quantity
665:does not
620:Arakkonam
470:All over
443:and from
427:Operators
267:Axle load
261: in)
243: in)
221: in)
197: in)
2028:electric
1720:WDS-3/4C
1703:Shunting
1656:WDG-2/3A
1626:WDP-2/3A
1259:35135033
1035:See also
838:Alambagh
750:Bhusaval
640:Bhusaval
401:
381:
295:Overhead
122:
64:Electric
686:removed
671:sources
606:Service
535:History
437:Numbers
321:HS15250
319:Hitachi
256:⁄
238:⁄
216:⁄
192:⁄
144:Co'-Co'
69:Builder
2098:WDAP-5
2069:WCAG-1
2053:WCAM-3
2043:WCAM-1
2012:WAG-12
2007:WAG-11
1977:WAG-6A
1694:WDG-6G
1684:WDG-4G
1589:WDM-3D
1583:WDM-3A
1573:WDM-2G
1548:Diesel
1257:
1247:
1168:
1011:Ratlam
985:Valsad
856:Jhansi
768:Howrah
646:Livery
636:Howrah
565:Design
481:Active
467:Locale
459:&
422:Career
248:Height
204:Length
169:Bogies
18:WAP-4E
2062:Goods
1997:WAG-9
1992:WAG-8
1987:WAG-7
1972:WAG-5
1967:WAG-4
1962:WAG-3
1957:WAG-2
1952:WAG-1
1945:Goods
1936:WAP-7
1931:WAP-6
1926:WAP-5
1921:WAP-4
1916:WAP-3
1911:WAP-2
1906:WAP-1
1890:WAM-4
1885:WAM-3
1880:WAM-2
1875:WAM-1
1846:WCG-2
1841:WCG-1
1834:Goods
1825:WCP-4
1820:WCP-3
1815:WCP-2
1810:WCP-1
1794:WCM-6
1789:WCM-5
1784:WCM-4
1779:WCM-3
1774:WCM-2
1769:WCM-1
1740:WDS-8
1735:WDS-6
1730:WDS-5
1715:WDS-2
1710:WDS-1
1689:WDG-5
1674:WDG-4
1649:Goods
1631:WDP-4
1621:WDP-1
1605:WDM-7
1600:WDM-6
1595:WDM-4
1578:WDM-3
1568:WDM-2
1563:WDM-1
1309:Steam
1187:(PDF)
1158:(PDF)
1137:(PDF)
1116:(PDF)
1090:(PDF)
1079:(PDF)
1062:Notes
1015:RTMD
1002:VTAD
998:Vatva
989:BLEE
971:SRCE
953:BZAE
935:EDDX
931:Erode
918:Erode
909:AJJE
891:IZND
878:GKPL
860:JHSE
842:AMVD
829:TKDD
798:DDUE
780:HWHD
772:HWHE
754:BSLL
736:Code
730:Zone
628:Erode
596:WAP-5
575:front
554:WAG-5
550:WAM-4
546:WAP-1
526:WAP-6
519:WAP-7
493:WAP-4
472:India
457:22999
453:22500
449:22399
445:22201
441:22061
226:Width
150:Gauge
81:India
35:WAP-4
1585:(3C)
1255:OCLC
1245:ISBN
1166:ISSN
1098:2024
1028:773
922:EDE
811:SPJD
669:any
667:cite
638:and
579:back
552:and
509:for
1451:AWC
1446:CWD
1441:AWE
1436:AWD
1018:10
1005:40
992:21
974:60
956:63
938:35
925:36
912:98
894:38
881:44
863:38
832:50
814:45
801:41
783:39
775:42
757:71
680:by
634:,
343:Air
332:Air
140:UIC
133:C-C
129:AAR
2119::
1678:4D
1668:3D
1664:3C
1660:3B
1639:4D
1637:,
1635:4B
1507:WW
1502:WV
1497:WU
1492:WT
1487:WM
1472:WG
1467:WP
1420:XS
1415:XT
1410:XP
1405:XH
1400:XG
1395:XF
1390:XE
1385:XD
1380:XC
1375:XB
1370:XA
1354:HT
1349:HG
1344:AP
1339:HP
1334:PT
1329:SG
1324:SP
1253:.
1189:.
1160:.
1139:.
1118:.
1081:.
845:2
642:.
630:,
626:,
622:,
521:.
500:AC
497:kV
451:,
258:16
240:32
218:32
214:29
79:,
75:,
1680:)
1676:(
1670:)
1666:,
1662:,
1658:(
1641:)
1633:(
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1172:.
1122:.
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701:(
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692:(
688:.
674:.
573:(
455:-
447:-
397::
254:3
236:5
233:+
231:5
211:+
209:7
194:2
190:1
187:+
185:5
163:)
159:(
20:)
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