The reference for locomotives and railcars
Finnish Railway Sv12 and Sr12
later Dv12
Finland | 1964 | 192 produced
Dv12 No. 2568 in April 2009 in Riihimäki
Dv12 No. 2568 in April 2009 in Riihimäki

The Sv12 is a diesel-hydraulic road locomotive built by Valmet and Lokomo between 1964 and 1984. It has bogies from the German V160, which can be switched between a top speed of 85 and 125 km/h. A version with an additional steam generator for passenger trains was called Sr12. After the steam generator was removed due to lack of demand, both variants were referred to as Dv12.

Since the installed power of 1,000 kW became too low over time, the locomotives are now mostly used double or triple headed. From 1978, No. 2501 was converted into an electric locomotive with 1,100 kW and tested in this form for four years. Since most of the main lines in Finland are now electrified, retirements began in 2009 and the remaining locomotives are now mainly used on branch lines and in shunting services. The diesel-electric, twin-engine Dr19 is currently being introduced as a successor on non-electrified lines.

Variant2501 - 25682601 - 26202621 - 26642701 - 2760
ManufacturerValmet, Lokomo
Axle configB-B 
Gauge4 ft 11 13/16 in (Russian broad gauge)
Dimensions and Weights
Length45 ft 11 3/16 in
Wheelbase31 ft 7 15/16 in
Fixed wheelbase8 ft 8 5/16 in
Service weight134,041 lbs145,064 lbs143,741 lbs137,127 lbs
Adhesive weight134,041 lbs145,064 lbs143,741 lbs137,127 lbs
Axle load34,172 lbs36,376 lbs35,935 lbs34,392 lbs
Power sourcediesel-hydraulic
Top speed78 mph
Starting effort44,063 lbf
EngineTampella MGO 16V BSHR
Engine typeV16 diesel
Engine output1,341 hp (1,000 kW)
Power Plant
Calculated Values
diesel locomotive
last changed: 01/2024

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