Market Overview - On August 18, the rail transit equipment sector rose by 0.68% compared to the previous trading day, with Tongye Technology leading the gains [1] - The Shanghai Composite Index closed at 3728.03, up 0.85%, while the Shenzhen Component Index closed at 11835.57, up 1.73% [1] Stock Performance - Key stocks in the rail transit equipment sector showed the following performance: - Tongye Technology (300960) closed at 36.20, up 6.78% with a trading volume of 66,300 shares [1] - Yonghui Electric (300351) closed at 20.15, up 5.00% with a trading volume of 441,600 shares [1] - Tianzhi New Materials (688033) closed at 7.15, up 4.84% with a trading volume of 283,800 shares [1] - Other notable stocks included Xianghe Industry (603500) and Tieda Technology (872541), both showing positive gains [1] Capital Flow - The rail transit equipment sector experienced a net outflow of 13.35 million yuan from institutional investors and a net outflow of 60.78 million yuan from speculative funds, while retail investors saw a net inflow of 74.13 million yuan [2] - The detailed capital flow for specific stocks indicated that China Railway Signal & Communication (688009) had a significant net outflow from both institutional and speculative investors [3] Individual Stock Analysis - China Railway Signal & Communication (688009) had a net outflow of 29.33 million yuan from institutional investors, indicating a 13.09% share of the total [3] - Yonghui Electric (300351) saw a net inflow of 22.63 million yuan from institutional investors, representing 2.58% of the total [3] - Xianghe Industry (603500) also had a positive net inflow of 18.19 million yuan from institutional investors, accounting for 5.24% [3]