The Black Forest Railway —also known as the Württembergische Schwarzwaldbahn to distinguish it from the railway of the same name in Baden—is a railway line in southern Germany from Stuttgart to Calw, passing through the foothills of the Black Forest, that was opened in stages between 1868 and 1872.

Calw is a town in the middle of Baden-Württemberg in the south of Germany, capital and largest town of the district Calw. It is located in the Northern Black Forest and is approximately 18 km (11 mi) south of Pforzheim and 33 km (21 mi) west of Stuttgart. It has the status of a große Kreisstadt.