The Tübingen–Horb railway is a railway line in the German state of Baden-Württemberg, continuing the Plochingen–Tübingen railway (also called the Neckar-Alb-Bahn) from Tübingen to Horb. Historically the line from Plochingen to Rottweil, including the Plochingen–Tübingen railway and part of the Stuttgart–Hattingen railway (sometimes called the Gäubahn—"Gäu Railway") was known as the Obere Neckarbahn ("Upper Neckar Railway").