HEAVY AXLE LOADS IN NATIONAL RAILWAYS OF MEXICO AND NEED FOR STRENGTHENING OF BRIDGES

National Railways of Mexico has been confronted with many low-capacity bridges on lines where heavy cars are being, or will be handled. While the new bridge standard is Cooper E72 rating, those built prior to 1970 range downward from E60 to E35 on some former narrow-gauge routes. NdeM has raised the ratings on some bridges since diesel locomotives have replaced steam with resultant reduced impact loadings. Slow orders are imposed on certain structures to handle concentrated program of strengthening bridges where it is reduce impact on bridges and use of neoprene pads under the rail base for the same reason have been widely applied. A concentrated program of strengthening bridges where it is economical has been undertaken. Bridges of low capacity or in bad condition are replaced.

Media Info

  • Features: Figures;
  • Pagination: p. 148-154

Subject/Index Terms

Filing Info

  • Accession Number: 00132976
  • 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