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The Indian locomotive class WDS-8 is a class of diesel-electric locomotive that was developed in 1979 by the Chittaranjan Locomotive Works for Indian Railways, but ended up being delivered exclusively to the private sector. The model name stands for broad gauge (W), Diesel (D), Shunter (S) engine, 8th generation (8). They entered service in 1979. A total of five WDS-8 locomotives was built at Chittaranjan Locomotive Works (CLW), Chittaranjan between 1979 and 1982.
All WDS-8 units were exported to the Steel Authority of India. As of November 2020, these locomotives have been withdrawn from service.
The history of the WDS-8 class begins in the early 1970s with the Railway Board's dual aims of addressing the shortcomings of the previous class of shunter/switcher locomotive (WDS-4) and of removing all of Indian Railways' steam locomotives from operational service by a target date of 1990. The WDS-8 was a competing bid from CLW to the Banaras Locomotive Works's WDS-6 class, intended for industrial concerns in the private sector as well as for the Railways itself. [1] The WDS-8 had a MAK diesel engine with a maximum output of 800 HP which was similar to the engine used in the newly upgraded YDM-1 class. They possessed short cabs modeled on those of CLW's electric locomotives with a single long, narrow hood. But unfortunately, this design was severely underpowered compared to the WDS-6 class. [2]
As a result of these shortcomings, CLW decided not to produce any more WDS-8 locomotives after these 5 units and they were then transferred to the plants of the Steel Authority of India (SAIL). [3]
As of November 2020, no locomotives of this class are in service.
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The Indian locomotive class WAP-7 is a class of 25 kV AC electric locomotives that was developed in 1999 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Passenger traffic (P) locomotive, 7th generation (7). They entered service in 2000. A total of 1532 WAP-7 have been built, with more units being built at CLW, Banaras Locomotive Works (BLW) and Patiala Locomotive Works (PLW).
Chittaranjan Locomotive Works (CLW) is an electric locomotive manufacturer based in India. The works are located at Chittaranjan in the Asansol Sadar subdivision of West Bengal, with an ancillary unit in Dankuni. The main unit is 32 km from Asansol and 237 km from Kolkata. CLW has stores and offices in Kolkata, as well as inspection cells in New Delhi, Mumbai, Kolkata, and Bangalore. It is the largest locomotive manufacturer unit in the world, producing 431 locomotives in 2019–20.
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The WDS-4 also known as Pappu is a class of diesel-hydraulic locomotive used by Indian Railways for shunting and departmental operations. The model name stands for broad gauge (W), Diesel (D), Shunting (S) engine. The WDS-4 was once used all over India but most have now been scrapped or condemned from active service.
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The Indian locomotive class YDM-2 is a class of diesel-Hydraulic locomotive that was developed in 1986-90 by Chittaranjan Locomotive Works for Indian Railways. The model name stands for Metre gauge (Y), Diesel (D), Mixed traffic (M) engine, 2nd generation (2). They entered service in 1986. A total of 41 YDM-2 locomotives was built between 1986 and 1990.
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The Indian locomotive class WCM-5 is a class of 1.5 kV DC electric locomotives that was developed in 1956 by Chittaranjan Locomotive Works (CLW) for Indian Railways. The model name stands for broad gauge (W), Direct Current (C), Mixed traffic (M) engine, 5th generation (5). The trains were the first locomotive of any kind fully developed and built in India. They entered service in 1961. A total of 21 WCM-5 locomotives was built at CLW between 1961 and 1963.
The class WDS-5 is a diesel-electric locomotive used by Indian Railways for shunting and doing departmental works. The model name stands for broad gauge (W), Diesel (D), Shunting (S) engine. The WDS-6 is used all over India.
The class WDS-3 was a diesel-hydraulic locomotive used by Indian Railways for shunting and doing departmental works. The model name stands for broad gauge (W), diesel (D), shunting (S) 3rd generation (3). The WDS-3 is used mostly in the Northern Railway Zone (NR). All these locomotives were withdrawn and scrapped by the late 1990s.
The class WDS-1 was a diesel-electric locomotive used by Indian Railways for shunting and doing departmental works. The model name stands for broad gauge (W), Diesel (D), Shunting (S) 1st generation (1). The WDS-1 is used mostly in the Northern Railway Zone (NR). All these locomotives were withdrawn by the late 1990s.
The Indian locomotive class WAG-1 was a class of 25 kV AC electric locomotives that was imported from Europe in the 1960s for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Goods traffic (G) locomotive, 1st generation (1). A total of 112 WAG-1 were built by The European Group 50 Hz Group/European Group/50 Cycles Group (consortium) between 1963 and 1966. They entered service in 1964.
The Indian locomotive class WAG-4 is a class of 25 kV AC electric locomotives that was manufactured by CLW in the late 1960s for Indian Railways. The model name stands for broad gauge (W), AC Current (A), Goods traffic (G) engine, 1st (1). A total of 186 WAG-4 locomotives were built by The European Group 50 Hz Group/European Group/50 Cycles Group (consortium) between 1967 and 1969. They entered service in 1967.
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The Indian locomotive class WAP-3 was a class of 25 kV AC electric locomotives that was designed by Research Design and Standards Organization (RDSO) and Chittaranjan Locomotive Works (CLW) for Indian Railways in 1987. The model name stands for Broad gauge (W), AC Current (A), Passenger traffic (P) locomotive, 3rd generation (3). They entered service in 1988. They were the faster variant of the previous WAP-1 class. A total of 9 WAP-3 were converted from existing WAP-1 units at CLW between 1987 and 1988. All locomotives were now withdrawn from service and converted back to WAP-1.