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Indian Railways operates 12000 trains everyday and half of them are hauled by the diesel locomotives. There are currently two types of locomotives being used over Indian Railways, the four stroke American Locomotive Company locomotives (ALCO) and the two stroke General Motors Electro Motive Division locomotives. There are commonalities as well as differences in these two locomotive engine technologies (EMD).For the past 6 decades ALCO locomotives are serving the nation and past 2 decades EMD locomotives are pressed into service. Salient features of these two technologies are not compared and as such this paper is an effort to compare the two engine technologies. All the major issues pertaining to locomotive engines are being compared in detail to have a good information of the same for a fair comparison. The paper includes the data made available by these two loco manufacturers originally from USA as well as data from diesel locomotive works, where they are currently under production.
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