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ICSE Notes 2017 : Physics (Narayana School, Rishra, Rishra)

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PHYSICIST_Mainak
Narayana Rajarhat, Kolkata
11 CAO battch Science IITBatch
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WDM 1: First mainline diesel electric locomotives used in India. Introduced in 1957. Imported from ALCO. Out of service now. 1,950 hp (1,450 kW) WDM 2: Most widely used and first homemade mainline diesel-electric locomotives in India. Original prototypes were made by ALCO. Introduced in 1962. More than 2,700 have been made. Rated at 2,600 hp (1,900 kW) WDM 2A, WDM 2B: Technical variants of WDM 2. WDM2A stands are dual braked and WDM2B are air braked usually WDM 2G: It is the first Multi-Gen-set locomotive of Indian Railway manufactured by DLMW, Patiala in 2013. As of February 2014 only 2 locos has entered service and has been numbered as #80000 and #80001.[3] It has been cleared for a maximum speed of 105 km/h (65 mph)[4] WDM 3: Only 8 were imported. They used hydraulic transmission and are currently nonfunctional. They are rated at 2,500 hp (1,900 kW), with a maximum speed of 120 km/h (75 mph). Built in 1970 by Henschel & Son) WDM 3A: Formerly known as WDM 2C. Another WDM 2 variant. It is not related to WDM 3. Max speed 120 km/h (75 mph). 30450 kgf of tractive effort. Built since 1994. It is one of the most heavily used diesel locomotives in India at present. WDM 3A R: Formerly WDM 2. It is a rebuilt with DBR fitted on short hood. It is not related to WDM 3. They are rebuilt at DLMW, Patiala WDM 3B: Co-Co bogies. Rated at 120 km/h (75 mph). These are based out of Uttar Pradesh sheds. 23 built by DLW. Similar to WDM3D. 3,100 hp (2,300 kW)[5] WDM 3C, WDM 3D: These are higher powered versions of WDM3A with 3,300 hp (2,500 kW). WDM3C is rebuilt from WDM2. WDM3C and WDM3D has max speed of 120 km/h (75 mph) and 160 km/h (99 mph) respectively WDM 3E : Reclassified as WDM 3D. Restricted to freight at 105 km/h (65 mph). 8 units known. Manufactured by DLW. 3,500 hp (2,600 kW) WDM 3F: Manufactured by DLW. 3,600 hp (2,700 kW). HAHS bogies. Conventional DBR. Air brake only. WDM 4: Entered service along with WDM 2. Prototypes designed by General Motors. Though considered superior to WDM 2 in many ways, these locomotives weren't chosen as General Motors did not agree to a technology transfer agreement. 2,600 hp (1,900 kW) WDM 6: Very rare class; only two were made; Exported to Sri Lanka. Rated at 1,350 hp (1,010 kW). Max speed 75 km/h (47 mph). 19200 kgf tractive effort. Fabricated Bo-Bo bogies

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