|Indian Railways imported 2900 HP passenger and freight locomotives along with transfer of technology from 50 cycles group in France in the year 1960. The indigenous production of locomotive was taken up at CLW in the year 1965. Indian Railways have been continuing with this technology for over 30 years and during this period improved it to optimize its use to produce 5000HP freight and passenger locomotives. With the increase in train loads and need for higher speeds both for passenger and freight to enable hauling of more traffic with existing infrastructure, it became important to upgrade existing technology of electric locomotives and, thus IR decided to go for most modern three phase high horse power electric locomotives. IR have acquired 30 nos (10 passenger and 20 freight) high horse power state of the art Microprocessor controlled GTO thyristor based three phase drive electric locos from M/s Bombardier Transportation (earlier called ABB), Switzerland along with transfer of technology (TOT) to manufacture them indigenously at Chittaranjan Locomotive Works (CLW). The contract was placed in july 2003. These locomotives have been received during the period 2005 Oct to 2007 Oct and have been put in service.
Through Transfer of Technology (ToT) agreement with Bombardier, Switzerland for 5 major electrical equipments i.e. Power Converter, Auxiliary Converter, Control Electronics, Transformer and Traction Motor to Indian Industry and three other items i.e. bogies, shell and traction motors to CLW, first indigenously built 3-phase electric locomotive was turned out by CLW a few years back. The cost of these locomotives has been progressively coming down from the original import cost of Rs. 22 cr. (excluding custom duties) through indigenization initiatives. CLW has so far manufactured 40 locomotives with indigenization of major items and the cost per locomotive has come down to 12.5 cr.