高铁一响，黄金万两。 日前，深圳市发改委启动广深第二高铁南延线规划建设方案预研招标，或将南延至香港。 无独有偶，京沪第二高铁、成渝中线高铁已全线动工，沪杭第二高铁有望于年底开工。 一时之间，超大城市，纷纷步入"第二高铁"时代。 无论京沪、广深还是成渝、沪杭，早在10多年前就已开通高铁，构成"八纵八横"高铁网络的主动脉。 如果将动车、城轨都囊括在内，重点城市之间的高铁线路远远不止一条。 仅广深之间，就有广深高铁、广深动车、穗莞深城际，未来还将有"跨市地铁"直连，远期还有"高速磁悬浮"。 中西部地区高铁干线普遍饱和，但经济发达、人口密集、商贸频密的超大城市，高铁远远不够。 一方面，超大城市之间的干线高铁，客流持续加大，运力日益紧张，高峰时期一票难求。 作为全球开行列车最多、客流密度最大、上座率最高的线路，京沪高铁最快4分钟一班车，频次堪比地铁。 根据规划，广深第二高铁，起于深圳机场东站，经东莞中心区、白云机场站至广州北站，向北衔接广清永州高铁，向南有望拓展到香 港。 有着沪杭第二高铁之称的沪乍杭高铁，始自上海东方枢纽，经上海、嘉兴到杭州，总体沿杭州湾北岸呈东西走向。 即使如此，京沪高铁在高峰时期仍然供不应求，加上 ...

Core Points - The Shenzhen Development and Reform Commission has officially initiated the pre-research bidding for the planning and construction of the Guangzhou-Shenzhen Second High-Speed Railway southern extension line, which is expected to enhance connectivity between Hong Kong and the mainland [1] - The Guangzhou-Shenzhen Second High-Speed Railway is part of the infrastructure connectivity plan approved by the National Development and Reform Commission in May 2020, aiming to create a new high-speed rail corridor from Shenzhen Airport to Guangzhou North Station [1][2] - The southern extension line is crucial for supporting the development of the Qianhai Cooperation Zone and promoting rail transit connectivity within the Guangdong-Hong Kong-Macao Greater Bay Area [1][5] Summary by Sections Project Overview - The Guangzhou-Shenzhen Second High-Speed Railway will connect Shenzhen Airport, Dongguan, Baiyun Airport, and Guangzhou North Station, linking to the Guangqing Yongzhou High-Speed Railway [1] - The specific route and station layout for the southern extension have not yet been defined [1] Historical Context - The project was prioritized as early as 2018 to address the growing demand for high-speed rail travel between the core urban areas of Guangzhou and Shenzhen [2] - The 2021 planning document confirmed the inclusion of the second high-speed rail corridor in national planning [5] Current Developments - The Guangdong Provincial Government has accelerated preliminary work on the second high-speed railway project, indicating progress towards its realization [5] - Existing rail connections between Guangzhou and Shenzhen, such as the Guangzhou-Shenzhen-Hong Kong High-Speed Railway and the Guangzhou-Shenzhen Railway, are insufficient to meet the increasing travel demand [6] Economic Impact - The new high-speed railway is projected to reduce commuting time between the two city centers to half an hour, significantly improving travel efficiency [6] - It will facilitate rapid connections between Guangzhou Baiyun Airport and Shenzhen Bao'an Airport, enhancing the competitiveness of the Greater Bay Area's airport resources [6]

Group 1 - The Shenzhen Municipal Development and Reform Commission has officially initiated the preliminary research bidding for the planning and construction of the Guangzhou-Shenzhen Second High-Speed Railway South Extension Line, which is expected to enhance connectivity between Hong Kong and the mainland [1] - The Guangzhou-Shenzhen Second High-Speed Railway, approved by the National Development and Reform Commission in May 2020, will connect Shenzhen Airport East Station to Guangzhou North Station, forming a new high-speed rail corridor to the southwest [1][2] - The South Extension Line is crucial for supporting the development of the Qianhai Cooperation Zone and promoting rail transit connectivity within the Guangdong-Hong Kong-Macao Greater Bay Area [1][5] Group 2 - The planning for the Guangzhou-Shenzhen Second High-Speed Railway was accelerated as early as 2018 to meet the growing demand for high-speed rail travel between the two cities [1][2] - The new high-speed rail line is expected to significantly reduce commuting time between the central urban areas of Guangzhou and Shenzhen to half an hour, saving over 50% of the current travel time [5] - The project aims to facilitate rapid connections between Guangzhou Baiyun Airport and Shenzhen Bao'an Airport, enhancing the competitiveness of the Greater Bay Area's airport resources [6] Group 3 - The existing rail connections between Guangzhou and Shenzhen, including the Guangzhou-Shenzhen-Hong Kong High-Speed Railway and the Guangzhou-Shenzhen Railway, are insufficient to meet the increasing travel demand due to their lower speeds and inconvenient access [5] - The Guangdong Provincial Government has included the Guangzhou-Shenzhen Second High-Speed Railway in national planning, indicating progress in the project's preliminary work [5]