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.
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Supplemental Notes:
- Proceedings of the 12th Annual Railroad Engineering Conference held at Pueblo, Colorado, October 23-24, 1975. The complete volume is RRIS 02 132958, Pricing is for the complete volume: Repr. PC $6.75, Microfiche$2.25, NTIS PB-252968/AS.
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Corporate Authors:
Federal Railroad Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Diaz, G R
- Conference:
- Publication Date: 1975-10
Media Info
- Features: Figures;
- Pagination: p. 148-154
Subject/Index Terms
- TRT Terms: Axle load force; Bridge construction; Bridge design; Bridges; Construction; Construction projects; Elastomers; Impact loads; Reconstruction; Structural design
- Identifier Terms: Ferrocarriles Nacionales de Mexico
- Old TRIS Terms: Axle loadings; Impact loading
- Subject Areas: Bridges and other structures; Construction; Railroads;
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