Group 1 - The central meteorological station forecasts a cold wave affecting central and eastern China from January 18 to 21, with strong winds, temperature drops, and widespread rain and snow, including heavy snow or blizzards in parts of Huanghuai and Jianghuai regions [1] - On January 19, heavy snow is expected in the northern areas between Huaihe and Jianghuai, with localized blizzards [1] Group 2 - To ensure train operation safety and passenger travel safety, the railway department has assessed the impact of snowfall and plans to temporarily suspend certain passenger trains from January 19, 8 AM to January 20, 8 AM on various high-speed rail lines [3] - The railway department will closely monitor weather conditions and dynamically adjust train operations, including speed limits, suspensions, and resumption of services to ensure passenger safety [3] Group 3 - Passengers are advised to check train operation information through station announcements or the railway customer service hotline 12306 for proper travel arrangements [5] - Passengers who purchased tickets for suspended trains can apply for refunds without fees within 30 days from the announcement of the suspension [5]