Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.The Eisenbahnfreunde Zollernbahn (EFZ) (Zollernbahn Railway Society) is a German railway society dedicated to the preservation of historic railway vehicles, especially steam locomotives, where possible in working order. The society arranges day and shuttle trips, predominantly in Baden-Württemberg in southwestern Germany. It is based at Rottweil.The operating company for the EFZ is the NeSA Eisenbahn-Betriebsgesellschaft Neckar-Schwarzwald-Alb-mbH (''Neckar-Black Forest-Alb Railway Operating Company'').The society was founded in 1973 in Balingen, Baden-Württemberg, by a number of railway fans, most of whom already knew each other but who now wanted to work more closely together. They gave talks and produced reports on railway history and operations. The society was named after the Zollernbahn (Zollern railway) which was near Balingen.