A collage from Finnish diesel locomotive Dv12, oldest of this series are now 45 years old, being built in 1960's (2500-series) and now, big part of 2500-series have been rebuilt, still having a active service time of 20-30 years in future. The last of these locomotives is built at 1984, the 2664. Series are 2501-2568 (1963-1966), 2701-2760 (1965-1972), 2601-2664 (1974-1984). For some reason 2700-series was built before 2600-series. Currently all are still in service, although there have been very bad accidents with some of those, all of them have been fixed up. Total number of locomotives: 192. Manufactured in Finland, paired numbers (eg. 2502) are manufactured by Valmet Oy, and unpaired numbers (eg.2501) are manufactured by Lokomo Oy. The main engine is Tampella-license built SACM MGO V16 BHSR. It has maximum power of 1000kW/1360 HP. The compressor engine is Valmet/Sisu 320D. The transmission is Voith L216 rs, fully hydraulic. It has two main gears, T-gear for freight trains, top...