SBB-CFF-FFS Bm 4/4

The Bm 4/4 is a class of heavy diesel shunting locomotives built for Swiss Federal Railways. 46 examples were built between 1960 and 1970, numbered 18401 to 18446, and a limited number remain in service. Starting in 2006, the class was slowly being replaced by new Vossloh-built locomotives.