The Hohenzollerische Landesbahn (HzL) was the largest non-federally owned railway company in the German state of Baden-Württemberg after the Albtal-Verkehrs-Gesellschaft and Südwestdeutsche Verkehrs-Aktiengesellschaft.

[2] The HzL began to build branches from the lines of the Württemberg State Railways to develop the Prussian territory.

At Christmas 1912 (24 December) the last gap was closed between Stetten and Hechingen, providing a continuous line from Eyach via Hechingen–Gammertingen–Hanfertal to Sigmaringendorf with a length of 86 km.

The 107.5 km long main line of the HzL was extended in January 2001 by the leasing of the 12.9 km-long non-dismantled section of the DB-owned Balingen–Rottweil railway between Balingen and Schomberg.

In addition, the HzL operates on behalf of the Ringzug the 2.8 km-long Bräunlingen–Hüfingen section of the Breg Valley Railway, which was originally owned by the Südwestdeutsche Verkehrs-Aktiengesellschaft.

In freight operations, since 1990, the HzL has taken over the hauling of salt block trains from Stetten (b Haigerloch) on DB lines to Ulm.

The HzL also hauls freight on flat wagon between Tübingen, Sigmaringen, Bad Saulgau and Schelklingen in cooperation with Deutsche Bahn (DB Cargo).

The most recent expansion took place on Lake Constance: in December 2006, it over operations under a new contract of the 17 kilometre-long route of the Seehäsle service over the Stockach–Radolfzell line from SBB GmbH, the German subsidiary of the Swiss Federal Railways.