what are the materials they are going to need?

ET3 will require traditional materials such as steel and concrete, and fiber reinforced composites.  ET3 that uses HTSM (a new form of maglev) requires advanced materials including high energy permanent magnets (for instance using Neodymium), and YBCO (Yttrium Barium Copper Oxide) superconductor films and / or bulk crystals.  Access portals will require typical building materials.  Tube material is most likely to be nonmetallic (to reduce magnetic drag), options include ultra high strength concrete (such as Ductal by LaFarge), or glass. 

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