Model of dieasel unit SN61, used by polis PKP railways. Produced n 1960-75  by hungary Ganz-MÁVAG factory, with qty over 250 pcs.  Durng production new innovation was appllied with changes on chasiss. Powered  by   diesel motor Ganz-Jendrassik 380kW  with  5-stage mechanical gearbox. Built-in steam generator for heating up to three coaches. 

Model has interrior lighting and  interface  Plux16