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Hard Underground Transit Processes Crossword Puzzle for Homeschool is a hard crossword puzzle with 14 clues covering . Play it online for free below, or create your own crossword with our free crossword maker.

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Hard Underground Transit Processes Crossword Puzzle for Homeschool
Challenge your knowledge of advanced underground transit slang processes in this hard crossword perfect for homeschool learners. Focus on specialized transit operations and methods.
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Across
  • 1. Horizontal entrances or access tunnels into underground routes
  • 2. System supplying fresh air to underground transit tunnels
  • 4. Process of slowing a train to a stop or reduce speed
  • 6. Regular careful examination of tunnels and equipment for safety
  • 12. Watertight structure used in underwater tunnel construction
  • 13. Method of creating subterranean passages by excavation
Down
  • 3. Removing excess air pressure inside tunnels for maintenance
  • 5. Refilling excavated space with engineering material after tunneling
  • 7. Process of controlling train movements via communication devices
  • 8. Precise positioning of tracks and tunnels for optimal flow
  • 9. Emergency procedure to clear passengers from underground areas
  • 10. Protective technique using a protective cover during excavation
  • 11. Devices providing status info on operational underground systems
  • 14. Supporting unstable tunnel walls during or after excavation
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