On August 24, the track project of Qingdao Metro Line No.4 supervised by CERIS obtained acceptance successfully and laid a solid foundation for the subsequent project acceptance, a dedicated government acceptance, and project completion acceptance.

Since CERIS entered the site in early 2021, it has cooperated closely with all participating companies, and the project progress, quality, safety, and other goals have been well controlled. On April 28, 2022, the rail project of Qingdao Line 4 successfully achieved "rail access" and took a vital step towards the goal of opening the entire line to traffic. With the strict, precise, and pragmatic work style with high-level team spirit, CERIS has won well-deserved approval from the construction company.