Austrian Southeastern Railway

The Austrian Southeastern Railway or Imperial-Royal Southeastern Railway () or kkSöStB was a state railway in Austria-Hungary, which was formed when the Hungarian Central Railway was ("Ungarische Zentralbahn", UZB) was nationalised.
History.
On 15 July 1846 the UZB opened the lines from Pest to Waitzen (now Vac), Pest to Szolnok and Marchegg to Pressburg (now Bratislava).
The UZB was nationalised on 7 March 1850 and became the Imperial Royal Southeastern State Railway.
The lines from Pressburg to Waitzen and Cegléd via Félegyháza to Szeged begun by the HZB were completed by the SöStB in 1854.
On 1 January 1855 the SöStB was privatised and became part of the StEG.