今日发售大年初六火车票，部分非热门线路推出最低2折优惠票价

Group 1 - The core point of the article highlights the significant increase in passenger traffic during the Spring Festival travel season, with the national railway expected to send 13.25 million passengers on February 8 and plans to add 1,688 passenger trains [1][4] - The railway department has implemented a minimum 20% discount on tickets for some less popular routes, providing travelers with more options and promoting balanced passenger flow [2][3] - As of February 8, over 150 million tickets have been sold for the Spring Festival travel period, indicating strong demand and effective management of ticket sales [1] Group 2 - Specific routes with sufficient remaining tickets include major cities such as Beijing, Shanghai, and Guangzhou, with various connections available from February 9 to 23 [2] - The introduction of night high-speed trains on key routes aims to enhance service availability and accommodate passenger needs, with tickets available for purchase five days before departure [3] - The railway department is utilizing big data from the 12306 platform to adjust services dynamically, ensuring efficient use of railway resources during peak travel times [3]