Group 1 - The core viewpoint of the articles highlights the ongoing progress and advancements in China's railway construction, emphasizing the strategic importance of various railway projects in enhancing regional connectivity and supporting economic development [1][2][3] Group 2 - The Xining to Chengdu railway, part of the "Eight Vertical and Eight Horizontal" high-speed rail network, is expected to significantly improve transportation links between the Lanzhou-Xining urban agglomeration and the Chengdu-Chongqing urban agglomeration [1] - The National Railway Group plans to invest 901.5 billion yuan in fixed assets by 2025, representing a 6% year-on-year increase, with the goal of completing 3,109 kilometers of new lines [1] - The construction of the Ba Mountain Village Tunnel, a key project on the Chongqing to Wanzhou high-speed railway, has successfully passed through complex geological conditions, showcasing the challenges faced in high-risk tunnel construction [2] - The Oujiang Public-Railway Bridge, part of the Wenzhou to Fuzhou high-speed railway, has commenced construction and will feature a main span of 700 meters, making it the largest four-line railway cable-stayed bridge in China [2] - The Taihu Station of the Shanghai-Suzhou-Xuzhou-Changzhou Intercity Railway is entering the main structure construction phase, utilizing advanced monitoring systems to ensure construction quality [3] - The Ganjia Tunnel of the Xining to Chengdu railway has surpassed 6,000 meters in excavation, employing advanced geological monitoring techniques to ensure safety and efficiency in a challenging environment [3] - The National Railway Group aims to accelerate project progress in the first quarter, enhancing the role of railway construction investment in building a modern railway infrastructure system [3]