工程机械板块9月19日涨3.03%，五新隧装领涨，主力资金净流入7.78亿元

Group 1 - The engineering machinery sector rose by 3.03% on September 19, with Wuxin Tunnel Equipment leading the gains [1] - The Shanghai Composite Index closed at 3820.09, down 0.3%, while the Shenzhen Component Index closed at 13070.86, down 0.04% [1] - Key stocks in the engineering machinery sector showed significant price increases, with Wuxin Tunnel Equipment up 11.57% and Shanhai Intelligent up 10.00% [1] Group 2 - The engineering machinery sector saw a net inflow of 778 million yuan from institutional investors, while retail investors experienced a net outflow of 881 million yuan [2][3] - Major stocks like Shanhai Intelligent and Yichong Heavy Industry had substantial net inflows from institutional investors, indicating strong interest [3] - The trading volume for Wuxin Tunnel Equipment reached 107,300 shares, contributing to a total transaction value of 670 million yuan [1]