Group 1: 19th Line Extension - The 19th Line Phase II, particularly the northern extension and branch line, is a highly anticipated project in Beijing's subway construction plan [1][3] - The project is set to commence soon, with the public resources trading service platform announcing that three essential design projects will be open for bidding next month [1][3] - The northern extension will span approximately 17.1 kilometers with seven stations, while the branch line will cover about 7.1 kilometers with one station [1][3] Group 2: Northeast Ring Railway - The Northeast Ring Railway is also progressing, with the construction and supervision bidding announcements expected in July [4] - The entire Northeast Ring line will stretch approximately 59 kilometers, with initial construction focusing on a 7-kilometer segment from the CBD to Beijing Chaoyang Station [4] - The construction is divided into three segments, each with a project duration of 1887 days, aligning with the environmental assessment report's timeline [6]

Core Viewpoint - The construction of the Northeast Ring Line of the suburban railway in Beijing is expected to commence soon, with a total estimated investment of 6.406 billion yuan for the segment from Guanghua Road to Beijing Chaoyang Station [1][4]. Group 1: Project Overview - The Northeast Ring Line has faced delays in the past but is now progressing rapidly, with various preliminary works accelerating [1]. - The segment under construction is approximately 7 kilometers long and will be built as a double-line tunnel, including civil engineering, installation works, and other related tasks [4]. - The entire Northeast Ring Line stretches about 59 kilometers, connecting from Nankou Station in the south to Guanghua Road Station in the north [5]. Group 2: Construction Details - The construction of the Guanghua Road to Beijing Chaoyang Station segment is expected to take 5 years, while the section from Beijing Chaoyang to Nankou will have a construction period of 2.5 years [8]. - The segment will feature three underground stations: Guanghua Road, Sihui, and Shifoying East [7].