https://indianpedia.org/index.php?action=history&feed=atom&title=Indian_locomotive_class_YAM-1Indian locomotive class YAM-1 - Revision history2026-07-31T22:44:28ZRevision history for this page on the wikiMediaWiki 1.45.4https://indianpedia.org/index.php?title=Indian_locomotive_class_YAM-1&diff=122739&oldid=prev>Monkbot at 00:14, 23 January 20212021-01-23T00:14:06Z<p></p>
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{{Use Indian English|date=May 2019}}<br />
{{Infobox locomotive<br />
| name = Indian YAM1<br />
| powertype = Electric<br />
| image = YAm1-21922.jpg<br />
| caption = YAM1 locomotive No. 21922 preserved at [[Chittaranjan Locomotive Works]], February 2007<br />
| builder = [[Mitsubishi]] , [[Hitachi]] & [[Toshiba]] <br />
| serialnumber = Mitsubishi 1238–1255, 1378–1379<br />
| builddate = 1964–1966<br />
| totalproduction = '''YAM-1:''' 20<br />
| uicclass = B′B′<br />
| gauge = {{track gauge|1m}}<br />
| locoweight = {{convert|52|t|lb|-2}}<br />
| electricsystem = [[25 kV AC railway electrification|25 kV AC overhead]]<br />
| collectionmethod = Two Faively AM-12 [[pantograph (rail)|pantograph]]s<br />
| tractionmotors = Two ACEC/[[Alstom]]/Siemens MG1420 truck-mounted of 1250&nbsp;V DC; 3.95:1 gear ratio<br />
| transmission = One [[Mitsubishi]] 'Shell Sub', 1690-kVA, 25-tap transformer; four 510 A, 1250 V, type A268, Secheron excitron rectifiers<br />
| maxspeed = {{convert|80|km/h|mph|0|abbr=on}}<br />
| poweroutput = {{convert|1300|kW|hp|-1|abbr=on}}<br />
| tractiveeffort = {{convert|191|kN|kgf lbf|sigfig=3|abbr=on}}<br />
| locobrakes = Air<br />
| trainbrakes = Vacuum<br />
| operator = [[Indian Railways]]’ [[Southern Railway zone]]<br />
| operatorclass = YAM-1<br />
| fleetnumbers = 21904–21923<br />
| nicknames = Pallava King, Vaigai Special <br />
| locale = Southern Railway (India)<br />
| withdrawndate = 30 June 2004 <br />
| preservedunits = 21909 at Regional Rail Museum, Chennai<br>21912 at [[Chittaranjan Locomotive Works|CLW]] Loco Park<br>21922 at [[Tambaram]] [[Electric multiple unit|EMU]] Shed<br />
}}<br />
'''Indian locomotive class YAM1''' is the first, and so far only class of [[metre gauge]] ('''Y'''), [[Alternating Current]] ('''A'''), mixed traffic ('''M''') electric locomotive in India. Twenty were built in 1964–66 by a Japanese consortium led by Mitsubushi.<br />
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==Background==<br />
When the Madras (now [[Chennai]]) to [[Tambaram]] line was electrified in 1931, the 1500&nbsp;V DC system was originally used. As part of an extension of the electrification to [[Villupuram]] in 1965, the whole section was converted to the [[25 kV AC railway electrification|25&nbsp;kV AC system]]. Eighteen YAM1 locomotives (later extended to 20) and YAU1 4-car electric multiple units were built for service on the network.<br />
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==Design==<br />
[[File:YAM-1 builders plate.jpg|thumb|left|Builders plate on a YAM-1. Note the year of manufacture at the bottom]]<br />
The YAM1 locomotives were supplied by Mitsubishi in 1964–66 (four in 1964, 14 in 1965 and two in 1966). They were jointly built by Mitsubishi, Toshiba and Hitachi, as shown by their builders' plates. They are of the [[Bo-Bo|B-B]] configuration, with two monomotor bogies, each with one bogie-mounted [[Direct current|DC]] traction motor; the two traction motors were permanently coupled in parallel. They had an Oerlikon compressor and exhauster for the locomotive's air brakes and the train's vacuum brakes, and Arno rotatory converters. They were equipped with two Faively AM-12 [[pantograph (rail)|pantograph]]s.<ref name="irfca AC electrics">{{cite web|url=http://www.irfca.org/faq/faq-loco2e.html |work=Indian Railways Fan Club |title=Electric Locomotive Classes – AC |access-date=2014-03-16}}</ref><br />
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==Service==<br />
They were not very powerful—they had a power output of {{convert|1.3|MW|hp|-1|abbr=on}}, a starting tractive effort of {{convert|191|kN|kgf lbf|sigfig=3|abbr=on}}, a maximum speed of {{convert|80|km/h|mph|0|abbr=on}}, and a weight of {{convert|52|t|lb|-2}}. They were given the fleet numbers 21904–21923.<ref>{{cite web |url=http://www.irfca.org/faq/faq-specs.html |work=Indian Railways Fan Club |title=Diesel and Electric Locomotive Specifications |access-date=2014-03-16}}</ref><br />
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They were used on the electrified metre gauge lines of the Southern Railway zone of [[Indian Railways]], usually in the Chennai area. <br />
With the conversion of the main lines to {{track gauge|1676 mm}} (broad) gauge, they were relegated to departmental service, although fifty-wagon goods trains were occasionally handled.{{fact|date=June 2019}}<br />
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In their latter days, all 20 locomotives were allocated to Tambaram Electric Shed. The last use of a YAM1 was on 30 June 2004, not long after the last EMU service on Chennai network reached Tambaram.{{fact|date=June 2019}}<br />
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One unit has been preserved at [[Chittaranjan Locomotive Works]].{{fact|date=June 2019}}<br />
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== Locomotive shed ==<br />
* All the locomotives of this class has been withdrawn from service.<br />
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== See also ==<br />
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* [[Indian locomotive class WAM-2/3]]<br />
* [[History of rail transport in India]]<br />
* [[Indian Railways]]<br />
* [[Locomotives of India]]<br />
* [[Rail transport in India]]<br />
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== References ==<br />
{{reflist}}<br />
*{{Hughes-IndianLocos4|p=63}}<br />
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==External links==<br />
{{Commons category|Indian locomotive class YAM1}}<br />
* http://www.irfca.org/faq/faq-specs.html#YAM-1<br />
{{Metre gauge locomotives of India|state=expanded}}<br />
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<br />
[[Category:Railway locomotives introduced in 1964]]<br />
[[Category:Metre gauge electric locomotives]]<br />
[[Category:Electric locomotives of India]]<br />
[[Category:Hitachi locomotives]]<br />
[[Category:Toshiba locomotives]]<br />
[[Category:25 kV AC locomotives]]<br />
[[Category:Mitsubishi locomotives]]</div>>Monkbot