If you lose something on Singapore MRT, act quickly: 1. Contact station staff immediately for assistance. 2. Check the Lost and Found website of operators like SMRT or LTA. 3. Provide details: item description, train time, and carriage number. Reports are processed within 24 hours; collect items from designated stations after verification. For valuables, file a police report if needed. Prevention tips: Label belongings and avoid rushing. Most items are recovered within days, but electronic devices may require evidence of ownership.