Group 1 - The K1572 train unexpectedly required passengers to disembark at Tianjin station, causing confusion among travelers [1] - Passengers were given two options: return to the original departure station or disembark at a stop along the route [3] - The train's return was attributed to severe weather conditions, including heavy rain and geological disaster warnings in various regions [5] Group 2 - Other trains have also experienced cancellations or returns due to adverse weather, indicating a broader issue affecting rail operations [5] - The duration of train cancellations is uncertain and depends on weather conditions and safety assessments [5] - Passengers who choose to disembark during the return journey can receive refunds for unused segments of their tickets [5]