The Dv12 (Sv12 and Sr12 until 1977[1]) is the standard Finnish medium-weight diesel-hydraulicroad switcher operated by VR. As all the main lines of Finnish railway network have been electrificied, the locomotive is designated mostly to unelectrified, less frequently used side lines.[2] Occasionally it may still pull cargo trains on main lines. It has also been put in service as a shunter, replacing older classes Dv15 and Dv16 as they were retired. A total of 192 locomotives were built by Lokomo and Valmet between the years 1963 and 1984.[3][4] As of 2022, the oldest Dv12 units still in use are 59 years old.
