Locomotive SU46 was developed  in Poland  in 1974 as succesor of SP45 used for express personal trains, with more power and electical  heating.   50pcs was producen in 1977-85, latter second series 260 pwas ordered, but onyl two pcs was finised.  They are SU46-53/54 and has small vissible difference. With engine rate 1650kW they was powerfull locos. Today they are used mostly on freigth  trains  under PKP cargo.  

Model is fitted with ball bearing trucks allowing smooth run, from supply 1V, with consumtion 100mA. Build in speaker.  Added DCC function for switching shunting signal, based on  PKP norm  Tb1.