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VR Class Dr12
VR Class Dr12 (original designation ''Hr12'') was a heavy diesel locomotive of Valtionrautatiet (Finnish State Railways). The first 6 locomotives were ordered in 1956. They entered service between 1959 and 1963. The locomotives were built by 2 manufacturers, Valmet and Lokomo, both based in Tampere. All Hr12 class locomotives with even numbers were produced by Valmet, while all odd numbers were produced by Lokomo. The locomotives were withdrawn in the early 1990s.
==Features ==
When it was introduced, the Dr12 gave drivers a new experience of comfort and forward visibility compared to steam locomotives, but compared to the newer VR Class Dr13, the Dr12 had a heavy axle load and slow acceleration with a top speed of only 120 km/h. The reason for this was that the locomotive turned out to be underpowered. The problem of the top speed was corrected in the last 10 locomotives by changing the transmission in such a way that the technical top speed was increased to 140 km/h, but this feature was never used. As a result, the entire locomotive series had a maximum permissible speed restricted to 120 km/h. However, due to the high axle weight, the Dr12 had good adhesion properties and it was considered to be a reliable and robust locomotive. It was well-suited to heavy trains with relatively low speed requirements.
In addition to the underpowered engine, the second problem of the Dr12 was the heavy axle load, which could damage lightly laid tracks. In practice it could only be used on Western Finland’s heavily laid lines.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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