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The war, especially strategic bombings by United States, damaged the railways heavily. The worst case was in Okinawa, which lost its railways until the opening of Okinawa Urban Monorail in 2003. In most cases, railways resumed operations fairly quickly. Some lines of the national railway resumed after the day of Tokyo bombing. San'yō Main Line resumed two days after the atomic bombing in Hiroshima, while Hiroshima Electric Railway resumed three days after.