BEIJING — The man who once ran China's powerful railways ministry wept as he admitted his guilt and sought leniency Sunday at his trial on corruption charges, one of the country's highest-level graft cases in years. Liu Zhijun, 60, who oversaw the ministry's high-profile bullet train development, has been accused of taking massive bribes and steering lucrative projects to associates. The case is seen as an indicator of how top-level officials might fare in an anti-corruption campaign that Chinese leader Xi Jinping has vowed will target both high and low officials. The case presents a thorny...