What is "raaberbahn"

The Raaberbahn or GySEV is an Austrian–Hungarian railway company based in Sopron, Hungary. The company is a joint enterprise of the states of Hungary (66.5%), Austria (28.6%) and a holding belonging to ÖBB Austrian Federal Railways (4.9%). In Hungarian it is called (GySEV), in German it was called (ROeEE) until 2008 when it changed to its name to Raaberbahn.