The Structural Clearance System consists of a rail-highway station wagon equipped with special optical devices that will record minimum clearance data on structures photographically. The clearance data on the obstruction contours are read directly from the exposed negative by means of a special film reader on a calibrated grid scale. Indexing marks on the grid scale permit precise alignment of the negative, providing data accuracies to within 1/2 inch. Actual tests on the Norfolk and Western Railway Company property were not successful, with many difficulties having been encountered. No worth while data could be gathered and the equipment was returned to the manufacturer.

  • Supplemental Notes:
    • Letter correspondence, File NIWRR.
  • Corporate Authors:

    Norfolk and Western Railway

    8 North Jefferson Street
    Roanoke, VA  United States  24011
  • Publication Date: 1970

Media Info

  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00033288
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 30 1976 12:00AM