Sri Lanka Railways M6 is a class of 16 Diesel-electric locomotives imported to Sri Lanka in 1979. Manufactured by Thyssen-Henschel in Kassel, West Germany, under
licence from Electro-Motive Division of the United States. As an EMD G22M, it has a V12 EMD 645 engine rated at 1,650 hp (1,230 kW). Most are still in service. Very successful in upcountry line, since it has Flexicoil truck (bogies) and dynamic brakes.
| Engine Class | M6 |
| Built Country | Germany |
| Builder | Thyssen-Henschel under licence from Electro-Motive Division |
| Imported Year | 1979 |
| Power Type | EMD 645E |
| Engine Type | V12 Two-stroke diesel |
| Power Output | 1,650 hp (1,230 kW) |
| Maximum Speed | 90 km/h (56 mph) |
| Axel Arrangement | A1A-A1A |
| Weight | 60-70 tons |
| Livery | General: Green and Red color Intercity Express: Orange and Red color |
| Total Produced | 16 |
Class M6 Locomotive Coupling at Pattipola

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