The Sr2 is a class of electric locomotives of the VR Group. They were built by SLM / ABB and later by Adtranz and finally Bombardier Transportation and assembled by Transtech Oy. They are closely based on the class Re 460 (or Lok 2000) locomotives of Swiss Federal Railways.The nicknames of this class are Alppiruusu (Edelweiss), Käkikello (Cuckoo clock), both referring to the Swiss origin of the locomotive, and Marsu (Guinea pig), from the looks of the locomotive.