4,500 horsepower boring machine ‘Heidi’ breaks through at the final section of Gotthard Base Tunnel, the world’s longest rail tunnel.

Share this on Facebook download .zip with all pictures

I dunno. [The cutter wheels don’t seem all *that* irregular.](http://i.imgur.com/LpEGH.jpg) Maybe a little, but you can sort of get the idea that it spirals bits of rock outward. The wheels in the center are also probably very slightly further ahead than the wheels at the edges. Maybe only an inch or two, I’d guess. As far as the flat metal sections between the wheels goes… I have no idea why they’re so irregular.

Latest Comments
  1. Nulad December 21, 2016
  2. Iaor December 18, 2016
  3. deardorff3 December 12, 2016
  4. southwickship5 December 5, 2016
  5. Neab December 4, 2016
  6. Orpsam December 3, 2016
  7. Rodyn November 18, 2016
  8. Fitinack November 9, 2016
  9. Stramald October 25, 2016
  10. Jacquiline1999 October 19, 2016
  11. panzergeneral October 15, 2016
  12. brusswszech October 5, 2016
  13. Adald September 12, 2016
  14. brusswszech September 11, 2016
  15. Claribel1 September 6, 2016
  16. Skelashat September 4, 2016
  17. panzergeneral August 31, 2016
  18. RSpofford August 15, 2016
  19. Reavis2000 July 22, 2016
  20. AlexTibbs July 19, 2016
  21. Tonser July 14, 2016
  22. Oldtiavor June 26, 2016
  23. Nicolhowle June 1, 2016
  24. Tryt May 23, 2016
  25. Orlye April 28, 2016
  26. Umedar April 1, 2016
  27. southwickship5 March 30, 2016
  28. EunaCalifano March 30, 2016
  29. Lavonne1 February 27, 2016
  30. walters1981 February 19, 2016
  31. Dotuton February 9, 2016
  32. urnisaw January 25, 2016
  33. RebeckaGuyton January 24, 2016
  34. guin7865 January 18, 2016
  35. WendellAhmad December 1, 2015
  36. Reavis2000 November 18, 2015
  37. Wartin November 10, 2015
  38. sarkisian93 November 5, 2015
  39. Tiarad October 5, 2015
  40. CatharineDorrance October 1, 2015
Comments are closed.