Indian locomotive class WAG-12

WAG 12 locomotive details

The origins of WAG-12B can be traced back to 2006. When the Government of India approved the Dedicated Freight Corridor (DFC) project and set up the DFCCIL to build it.[3] In order to run trains at maximum efficiency, even the most powerful locomotive of that era, the WAG-9 was found inadequate. Hence, it was decided to procure new, powerful locomotives for dedicated operations on the two DFCs in an manner unlike it was done until now, where locos were built at CLW by Indian Railways under technology transfer agreements.[4]

In June 2008, the Ministry of Railways invited bids from global firms to design and develop the locomotives. The initial deal was to set up a new electric locomotive factory at Madhepura, Bihar to build and maintain 660 high-horsepower locomotives in a joint venture where Indian Railways would hold a 26% stake and the bidder 74%. This would have been the first foreign direct investment in the fully state-owned railway sector of the country.[5]

This invitation received bids from General Electric, Alstom, Bombardier Transportation, Siemens Mobility, China CNR and CSR Corporation. The number of locomotives to be built was subsequently increased from 660 to 800.[3] The Research Design and Standards Organisation published a specification in June 2013,[6] detailing the capability requirements for an eight-axle locomotive intended to be used on Dedicated Freight Corridors (DFC). It was not until November 2015, however, that Alstom was finally awarded the contract to build the locomotives.[7]

Development of the locomotive began after the Ministry of Railways and Alstom signed a contract worth ₹25,000 crore (equivalent to ₹380 billion or US$4.7 billion in 2023).[8][9] and created a joint venture for the project. The largest Foreign Direct Investment (FDI) project of Indian Railways, the first locomotive was initially expected to enter service on 28 February 2018.[10] Alstom announced that the new locomotive would be based on its highly successful Prima II model. Alstom calls it the Prima T8. This was the first time in 20 years that Indian Railways procured new locomotives.[11][12]

However, the locomotive was launched by Prime Minister Narendra Modi in Madhepura, Bihar on 10 April 2018.[13]

As development of the engines progressed, Alstom outsourced the task of producing traction transformers for the locomotives to Swedish-Swiss multinational corporation ABB in 2016. These all-weather transformers were to be produced in Vadodara, Gujarat.[14] In 2017, Alstom outsourced the task of developing, testing, and maintaining the brakes of the locomotives to German brake manufacturing firm Knorr-Bremse. These brakes were to be produced at Palwal in the Indian state of Haryana.[15] The couplers of the locomotive were designed and developed by French Railway company Faiveley Transport. Around 85-90% of the components will be procured from within India.[16]

The first body shell of the locomotive was delivered to the Haldia Port in West Bengal on 20 September 2017. It was then transferred to the Electric Locomotive Factory (Alstom Madhepura) for final assembly,[4] which began on 11 October 2017.[17][18] The first locomotive, numbered 60001, was tested in the Madhepura factory on 27 February 2018, one day before its initial launch date.[10][19]

Deliveries of the locomotives are planned from 2018 through 2028, with the first locomotive slated to enter service in 2018, and a total of five by 2019. This is to be followed by the assembly of 35 new locomotives in 2020, 60 in 2021, and 100 locomotives each year from 2022 until all 800 locomotives are delivered. [17]

It is the original version which was imported. Limitations of the original WAG-12 design resulted in modifications and the WAG-12B variant. Only one unit (60001) was made. This unit has been modified to WAG-12B specification.[25]

It is the current version in production. Differences with WAG-12A variant include: