Between 1964 and 1970, the TEŽ was therefore completely refurbished, in preparation for the FIS Nordic World Ski Championships 1970, which were held in the area. The class EMU 89.0 vehicles entered service on the TEŽ between 1965 and 1969 as an integral part of the refurbishment. They replaced an obsolete fleet of vehicles, of classes EMU 25.0, EMU 26.0, EMU 28.0, EMU 48.0 and EMU 49.0. The oldest of these obsolete vehicles had entered service in 1912, and the youngest in 1956.