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Japan Transport Safety Board Blames Isumi Railway Derailment on Failed Track Maintenance

The safety panel urges concrete sleepers with outside support to address the operator's limited technical capacity.

Overview

  • Investigators conclude that a run of decayed and cracked wooden sleepers let the track gauge widen on a right-hand curve, leading to the Oct. 4, 2024 derailment.
  • Pre-accident inspections found 1,656 locations out of standard across the line, but only 23 were repaired within internal deadlines due to budget and workforce constraints.
  • The report notes six of eight axles derailed, nine of 21 sleepers near the site were damaged, and one rail toppled over under derailment forces.
  • The board recommends overhauling track management and replacing wooden ties with concrete, calling for cooperation from national and local governments.
  • Service on the 26.8-kilometer line remains suspended, and the operator is targeting a resumption in autumn 2027.