 
 <prompt> At di same voltage e get more loss? Given di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```But di mata be say, some railway operators dey show interest for di use of DC for higher voltages pass wetin dem bin dey use before. For di same voltage, DC dey get less loss pass AC, and na why high-voltage direct current don dey use for some bulk power transmission lines. DC no get di electromagnetic radiation wey dey come with AC, and for railway, e dey reduce interference with signalling and communications and e dey reduce di risk of EMF wahala. DC also no get di power factor wahala wey AC get. Wetin dey interest railway people pass be say DC fit supply constant power with just one ungrounded wire. For AC to supply constant power, e need three-phase transmission with at least two ungrounded wires. Another important thing be say, mains-frequency 3-phase AC need to dey carefully planned to avoid unbalanced phase loads. Some parts of di system dey get supply from different phases based on di assumption say di total loads of di 3 phases go balance. For di phase break points between regions wey get supply from different phases, long insulated supply breaks dey needed to avoid short circuit by rolling stock wey dey use more than one pantograph at a time. Some railroads don try 3-phase but di plenty complexity wey e get don make single-phase standard practice despite di interruption wey dey happen for power flow twice every cycle. An experimental 6 kV DC railway bin dey built for Soviet Union.``` 