Overview
- The discoveries are part of a nationwide review ordered after the October 2025 Tokyu Den-en-toshi Line collision, which investigators traced to a signal set to show a proceed aspect when a stop was required.
- JR Hokkaido and JR East reported the newly affected sites as Otaru on the Hakodate Line and Kogota, Kurihashi and Nikko on JR East lines, and said inspections and fixes at those four stations are complete.
- The Ministry of Land, Infrastructure, Transport and Tourism has received reports that errors like these have been found across dozens of locations, with coverage noting a total of 12 operators and 36 stations identified so far.
- Rail companies say the misconfigurations largely date to legacy setups from the Japan National Railways era and that none of the newly found points caused accidents and have been secured by repairs or operational measures.
- The findings have put pressure on operators to improve configuration management, documentation and oversight of ageing signal equipment, and could lead to wider upgrades and tighter regulatory checks that affect service planning and budgets.