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To make use of residual regenerative energy in d.c. traction power supply system, some energy storage systems have already installed in Japan. We, East Japan Railway Company, also installed two Lithium ion battery systems at Haijima Substation in 2013 and at Okegawa Substation in 2014, respectively. They contributed to reduce traction power supply from substation about 5–8% annually. Because the load...
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