VR Class Sr1
The Sr1 is a class of electric locomotives built for VR of Finland. These 25 kV locomotives were built in the Soviet Union at the Novocherkassk Electric Locomotive Factory between 1973 and 1985. Two additional locomotives of this class were built at the VR Hyvinkää Machine Workshop in 1993 and 1995, number 3111 from spare parts and number 3112 from the original prototype locomotive that was never used by the VR. The official classification given by the manufacturer is VL70 or ES40.
The nicknames for these locomotives are "Siperian susi", "Kaalihäkki" and "Sähköryssä".
History
In 1970, Valtionrautatiet ordered 27 electric locomotives from Energomachexport, which were delivered between September 1973 and the end of the year 1975. 82 additional locomotives were ordered and delivered between 1973 and 1985. The first prototype locomotive, number 3000, was bought from the constructor in 1994 by VR, which rebuilt it into number 3112.The trains have been used in passenger and cargo transport on Finland's electrified rail network.
A list of overall locomotives made is shown below:
| Year | Number of units delivered | Unit numbers | Notes |
| 1971 | 1 | 3000 | Prototype locomotive. Kept by NEVZ up till the mid 1990s. |
| 1973 | 4 | 3001–3004 | First batch, introduced the same year. |
| 1974 | 2 | 3005–3006 | First batch. |
| 1975 | 21 | 3007–3027 | First batch. |
| 1976 | 12 | 3028–3039 | |
| 1977 | 12 | 3040–3051 | |
| 1978 | 12 | 3052–3063 | |
| 1979 | 12 | 3064–3075 | |
| 1980 | 10 | 3076–3085 | |
| 1981 | 7 | 3086–3092 | |
| 1982 | 6 | 3093–3098 | |
| 1983 | 6 | 3099–3104 | |
| 1984 | 5 | 3105–3109 | |
| 1985 | 1 | 3110 | |
| 1993 | 1 | 3111 | Built at Hyvinkää in Finland from spare parts. |
| 1995 | 1 | 3112 | Rebuilt at Hyvinkää in Finland from unit 3000. |
Livery
The locomotives originally carried a dark red livery, with light yellow stripes around and below the cab windows. The stripes were later replaced with yellow warning panels below the cab windows. From the early 1990s onwards this livery was replaced by an off-white livery with red stripes. Nowadays the locomotives are refitted with a white-green livery to go with the current company colours.Technical information
Electrical equipment for the locomotives was supplied by the Finnish company Oy Strömberg.Locomotives number 3098–3110 were rebuilt with new bogies allowing a higher maximum speed in the 1990s, but since 2003 they have been restored back to the original top speed due to the speed being raised at the expense of tractive effort. The last Sr1 to be equipped with bogies allowing 160 km/h was number 3107.