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Terminus of the Uetlibergbahn in an underground concourse below the main station. This line is part of a private company called SZU (Sihltal-Zürich-Uetliberg-Bahn), which operates the S10 aka Uetlibergbahn, and the S4, a suburban line. S4, the red train on the right, uses the standard catenary, S10 uses the offset catenary.