The reporter learned from China Railway Shanghai Bureau Group Co., Ltd. that on February 20, the Shangtianling Tunnel, a control project of the new Chizhou-Huangshan high-speed railway (hereinafter referred to as the Chihuang high-speed railway), successfully broke through, becoming the first single-hole double-line long tunnel of more than 10 kilometers on the entire line, marking the phased progress of the construction of the Chihuang high-speed railway.