Group 1 - The Baoyin High-speed Railway from Baotou to Yinchuan will be completed and opened for operation on December 23, with ticket sales already underway [1] - The total length of the Baoyin High-speed Railway is 519 kilometers, and the newly opened section from Baotou to Huinong is 422 kilometers long, featuring 10 stations [1] - Initial operation will see trains running at a maximum speed of 250 kilometers per hour, reducing travel time from Hohhot to Yinchuan to 4 hours and 3 minutes, and from Baotou to Yinchuan to just 2 hours and 38 minutes [1] Group 2 - The Guangzhan High-speed Railway officially opened on December 22, significantly reducing travel time between Zhanjiang and Guangzhou to 1 hour and 32 minutes, approximately halving the previous duration [2] - The Shantou-Shantou South High-speed Railway achieved full-line operation on December 22, with the opening of the last segment further compressing the time distance between the Guangdong-Hong Kong-Macao Greater Bay Area and the eastern Guangdong economic zone [3]