| August | 1961 | DLW set up as a green field project in technical collaboration with ALCO, USA for manufacture of Diesel Electric Locomotives |
| January | 1964 | First Locomotive rolled out and dedicated to the Nation |
| January | 1976 | Entered Export market, first locomotive exported to Tanzania |
| December | 1977 | First Diesel Generating Set commissioned |
| October | 1995 | The Transfer of Technology agreement was signed |
| March | 2002 | The first indigenous EMD WDG4 freight loco manufactured |
| November | 2002 | 3600 HP Engine produced |
| March | 2003 | The first indigenous passenger version of EMD loco WDP4 manufactured |
| September | 2003 | Development of 16 cylinder 3300 HP Power upgraded DLW engine, WDM3D locomotive |
| 2006 |
| 5000th locomotive produced |
| November | 2006 | DLW manufactured first WDG4 locomotive equipped with IGBT based converter |
| March | 2007 | First WDP4 locomotive equipped with IGBT based converter |
| April | 2007 | DLW has successfully switched over to use of microprocessor based control system on all its locomotives. |
| March | 2009 | 257 locomotives manufactured in 2008-09, highest ever locomotive production |
| November | 2009 | 5690 locomotives upto 30th Nov'2009(including 348 EMD locos) |
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