It is estimated there are 3500 miles of bridges on American railroads; replacement cost is estimated at $10 billion. The problem is not the spectacular, long-span steel bridges, but the many structures built many years ago for much lighter loading. As reconstruction is deferred, more speed and weight restrictions will have to be imposed; modern equipment may have to be prohibited from many lines. With scarce capital it will be many years before the frail steel spans of 1880-1900 are replaced. The Cooper E-60 rating permitted by the AAR Mechanical Division does not produce cars capable of unrestricted operation over the rail network. Timber trestles are particularly vulnerable to closely spaced axles.

Media Info

  • Features: Figures;
  • Pagination: p. 133-138

Subject/Index Terms

Filing Info

  • Accession Number: 00132974
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Report/Paper Numbers: FRA OR&D 76-243
  • Files: TRIS, USDOT
  • Created Date: Jun 5 1976 12:00AM