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Big Thunder Mountain Railroad Starts Train Testing as New Permit Signals Ongoing Construction

The latest filing confirms work remains active during ride-system validation for the overhauled Magic Kingdom coaster.

Overview

  • Walt Disney Imagineering filed a November 17 Notice of Commencement listing Coastal Steel Inc. for general construction, the third such permit tied to the project.
  • Refurbished trains were observed cycling the replaced track, with early runs spaced several minutes apart and water-filled containers used to simulate rider weight.
  • Outlets report testing focuses on safety systems, braking, lift hill timing, and train dynamics following the ride’s full track replacement.
  • Disney still targets a 2026 return with no date announced, and permit windows extending into next year indicate work and adjustments may continue into 2026.
  • When it reopens, the attraction will feature a new Rainbow Caverns sequence and an updated Barnabas T. Bullion backstory alongside technical and show refreshes.