The Dv12 class (Sv12 and Sr12 until 1977) was developed as the standard VR of Finland's medium-weight diesel-hydraulic road locomotive. As all the main lines of Finnish railway network have been electrified, these are assigned mostly to unelectrified secondary lines. Occasionally they may still pull cargo trains on main lines. They have 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 1963 and 1984.
The Dv12 was designed for both passenger and cargo train use. Its 1000 kW (1330 hp) power is low by current standards, but it is capable of multiple-unit operation with only one train crew and doublets and triplets are common. It has a low axle load of 15.6 tonnes, which makes it very well suited for lines that allow only smaller axle loads because of the track standard. All the axles are interconnected with shafts and universal joints to the Voith L 216 rs hydraulic transmission. Because all axles must rotate at the same speed, the individual slipping of axles is impossible. This translates into a very good tractive effort for a 62 tonne locomotive. The main engine is a Finnish-built Tampella SACM MGO V16 BSHR Diesel with two Brown Boveri-VTR 200 M turbochargers.
The Dv12 has two operating speeds, 85 km/h (53 mph) for cargo use and 125 km/h (78 mph) for passenger use. This mechanical gear can only be switched with the locomotive at standstill. (edited from wikipedia)
Builder: Valmet Oy Tampere / Rauma-Repola Oy Lokomo, Finland
UIC type classification: B′B′
Gauge: 1,524 mm (60 inches or 5ft)
Driving wheel diameter: 1 metre (3 ft 3 in)
Length 14 metres (45.93 ft)
Width: 3.24 metres (10.6 ft)
Height: 4.6 metres (15 ft)
Locomotive weight: 62.2 tonnes (61.2 long tons; 68.6 short tons)
Transmission: Hydraulic Voith L 216 rs
Tractive effort: 200 kN (45,000 lbf)
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