The railway-standard EN50155 distinguishes the temperature classes T1 (-25°C .. +70°C), T2 (-40°C .. +70°C), T3 (-25°C .. +85°C) and TX (-40°C .. +85°C). However, in many regions of the world it can get colder than -40°C. For instance in Russia, temperatures down to -50°C are expected. intreXis has invested a lot in research for the proper functioning of the power supplies - and hence the whole locomotive - at these extreme temperatures: intreXis has designed a family of converters, which operates over the entire temperature range from -50°C .. +85°C without any restrictions.