1. On Sunday, two trains collided on the Tokyu Den-en-toshi Line operated by Tokyu Railways near Tokyo, causing a partial derailment and affecting around 650,000 passengers.
2. Investigations have found an error in a program that activates a safety system to prevent collisions, which may have caused the accident. The error did not display a red light on the driver's cab and prevented the running train from automatically applying the brake.
3. Tokyu Railways President Fukuta Seiichi has apologized for the incident, promised a thorough investigation into its cause, and pledged to implement measures to prevent similar accidents in the future. The company is conducting emergency inspections on relevant programs installed on all lines.