Dynamic interactions among the AC railway traction network and power electronics converters feeding the trains have been reported to cause low-frequency oscillations (LFO) of the catenary voltage and current. This can result in railway system instability. eventually leading to a power outage and the shutdown of the train traffic. To avoid LFO. https://www.markbroyard.com/best-flash-pp-aluminum-lotion-pump-supply-amazing-save/