Recently, a carbon fiber metro train, dubbed CETROVO 1.0, began passenger service in Qingdao City, Shandong Province, leading China's metro trains to achieve a new lightweight and green upgrade. This metro train features a carbon fiber composite body and frame, which reduces the weight of the car body and bogie frame by 25 percent and 50 percent, respectively, making the total vehicle weight 11 percent lighter compared with conventional trains. Notably, the use of carbon fiber materials also reinforces the vehicle's body, boosts its impact resistance and extends the durability of its structure.