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Abstract: The capital of Baden Württemberg, Stuttgart, is extending its commuting network. The subway line U12 is therefore being completely reorganized: some parts of it are being closed down and other parts are being built from scratch. A joint venture consisting of Leonhard Weiß Ingenieurbau, Alfred Kunz Untertagebau and Bauer Spezialtiefbau was awarded the construction of lot 3 of subway U12. Altred...