How do the AC-DC locos (WCAM series) switch from one power source to another on the run?

22-06-2019

The WCAM-1 has a selector on the rightmost side of horizontal control panel for selecting the pantograph. It has four positions, DC, AC, DC-ALT and AC-ALT. In DC and AC-ALT mode, pantograph with two collector shoes is raised; in AC and DC-ALT, pantograph with one collector shoe is raised. The DC pantograph has two shoes and is thicker in its contact area than the AC pantograph because it has to carry a larger current corresponding to the lower voltage. The ALT positions allow the DC pantograph to be used for AC traction or the AC pantograph to be used for DC traction, in case of damage to one or the other pantograph. I.e., the pantograph itself does not control whether the DC or AC

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What gauges are used in India?
June 27, 2019

Broad Gauge - 5'6" (1676mm) This is now found all over the country, and all major passenger and freight routes are now broad gauge. This is the widest gauge in regular use anywhere in the world. (In the past, though, an 8' gauge was used in Oregon, USA, and a 7'¼" gauge was used for the Great Western Railway in the UK.) Outside India, the 5'6"

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Appendix: Steam loco wheel arrangements
June 25, 2019

As I expect most people who read this document will not be railway enthusiasts and would be researching a period when the steam locomotive reigned supreme, I thought that some very brief notes on steam locomotive wheel arrangement should be included. ये भी पढ़े - योगासन का इतिहास तथा योग से

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Books
June 25, 2019

The Indian Railways FAQ section on books on Indian Railway history shows what has been available. For general overviews of history, see the books by Westwood, Kerr, and Sahni. The books by Bhandari have concise summaries of the histories of several railway systems. The 3-volume set, Railway Construction in India, has a lot of historical detail on

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Wheel and Axle Plant (now Rail Wheel Factory)
June 25, 2019

WAP was set up in 1984 at Yelahanka, in Bangalore, for the manufacture of wheels and axles, since other local manufacturers such as the Durgapur Steel Plant were unable to satisfy IR's needs, and imports were costly. WAP uses some advanced techniques such as pressure-moulding of wheels. A lot of WAP's products are made from scrap metal generated

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Parel Workshops, CR
June 22, 2019

Parel Workshops of CR have been manufacturing diesel shunters (WDS-6 class, mostly) using components produced by DCW and DLW, since 2006. The workshops are also a leading establishment for repairs and overhauls of locomotives. Established in 1879, they were engaged in steam locomotive repair and overhaul and since 1972 (after the decline of BG

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Diesel Modernization Works, Patiala
June 22, 2019

DMW, Patiala, formerly known as the Diesel Component Works(DCW) was set up in October 1981 for the manufacture of diesel and electric loco spare parts. DCW manufactures large components such as traction motors and locomotive power packs, rebuilds engine blocks, traction generators, etc. They have more recently been upgrading WDM-2 locos to WDM-2C

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