Sri Lanka Railways Class W1 is a diesel-hydraulic locomotive that was built by Rheinstahl Henschel in 1969. A total of 45 W1s were built and imported. This is the first diesel-hydraulic locomotive which ran on Sri Lankan rail.
| Engine Class | W1 |
| Built Country | Germany |
| Builder | Henschel Thyssen |
| Imported Year | 1969 |
| Power Type | Diesel Hydraulic |
| Engine Type | Paxman V12 12YJXL |
| Power Output | 1150 HP |
| Maximum Speed | 80 KMPH |
| Axel Arrangement | B-B |
| Weight | 60.5 T |
| Livery | Green, Red and Yellow strip |
| Total Imported | 45 (No. 630-674) |
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