INCREASE OF THE PERMISSIBLE LOAD OF S AND SS WAGONS. INFLUENCE OF THE NATURE OF WAGONS{ THE SPEED AND THE SUB RATED WHEEL LOAD ON THE FATIGUE OF THE TRACK

The object of these tests, which were carried out by the SNCF in 1969 on a track in an average condition of maintenance, was to examine the possibility of increasing the maximum axle-load of modern wagons in S and SS service, which is at present 18 t and 16 t respectively. A large number of strain gauge measurements were taken on the track to determine the statistical distribution of the dynamic forces exerted on the track by vehicles (on old-type wagon and modern non-bogie wagons) in different load conditions and at different speeds. It seems in fact that the transverse forces are very weak (less than 10 to 4th power N), and so only the vertical forces were considered. Two vehicle-effect indices were considered, based on the standard deviation of the statistical distribution of the forces and characterising (a) the damage caused to the track per gross-tonne and per kilometre, and (b) the maximum dynamic wheel-load. It was established that the maximum permissible loads should be 19.5 t for modern non-bogie wagons used in SS service and 20 t in other cases (S service and modern bogie wagons in SS service) in order to ensure that their effect on the track is not greater than that of the old-type wagons.

• Supplemental Notes:
  • Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Publication Date: 1970-4

Media Info

• Features: Appendices; Figures;
• Pagination: 15 p.

Subject/Index Terms

• TRT Terms: Axle load force; Computer programs; Dynamics; Railroad rails; Stresses; Train track dynamics; Wheel loads; Wheels
• Identifier Terms: FORTRAN (Computer program language); Societe nationale des chemins de fer francais
• Old TRIS Terms: Axle loadings; Question c113; Rail stress
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00052795
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: C113/RP 1/E
• Files: TRIS
• Created Date: May 14 1976 12:00AM