Wikipedia: "By mid-2005, each ICE 1 trainset built in 1991, had travelled 6.5 to 7.9 million kilometers and had been in revenue service for up to 14 years. In the summer of 2005 a refurbishment program was started, referred to by Deutsche Bahn as "Redesign". It is planned to toughen up all trainsets for another 10 to 15 years of service at the Nuremberg main railway workshop completing in December 2008. For the refurbishment, trainsets are taken out of service for five weeks (25 work days). Refurbishing a single ICE 1 trainsets costs about three million Euro, a fraction of the cost of buying new trains. The entire program cost about 180 million Euro.
About 80 percent of the materials are re-used, including 16,000 tons to steel and 1,200 tons of copper from the power cars' traction motors. Compared to buying new trains, the program saves about 1.3 billion Euro. about 35,000 tons of carbon dioxide emissions are avoided as well as about 500,000 tons of industrial waste"