A train utilizing state-of-the art equipment operating in a low pressure (3.5 psia) underground tunnel is analyzed. The tunnel is smaller (13.75 feet in diameter) than conventional subway tunnels (16 to 18 feet in diameter). The tunnel is deeper (200 to 500 feet) than most subways. The additonal depth provides assistance to the propulsion system during acceleration and to the braking system during deceleration. The reduction in tunnel size and cost offsets the additional cost of vacuum pumps of conventional urban systems, while at the same time energy costs are reduced. The system speed is great enough to provide high capacity as a shuttle service utilizing a single tube, which may have application in an airport access link.

  • Supplemental Notes:
    • Report on High-Speed Ground Transportation Systems Engineering Study.
  • Corporate Authors:

    TRW Systems Group

    One Space Park
    Redondo Beach, CA  United States  90278
  • Authors:
    • King, M
    • SMYLIE, J W
  • Publication Date: 1970-6

Media Info

  • Pagination: 56 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00039222
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: 06818-6042-R000 Final Rpt
  • Contract Numbers: DOT-C-353-66
  • Files: TRIS
  • Created Date: Dec 15 1973 12:00AM