PREVENTION OF DERAILMENT OF GOODS WAGONS ON DISTORTED TRACKS. WHEEL LOAD MEASUREMENTS AS A MEANS FOR TESTING 2-AXLED GOODS WAGONS

When a 2-axled wagon runs at low speed on a track with varying "twist", the two vertical wheel-loads of one and the same axle are constantly subjected to variations or divergencies which, at every moment, are of equal magnitude but of opposed direction with respect of half the axle-load, which remains almost constant. In order that the wagon can run with the desired safety on all tracks - in that state of maintenance of these considered as economically permissible - it is important that these wheel-load variations are as small as possible and that they remain within a given maximum permissible value, defined by the experimental investigations described in Interim Report No. 3. When the wagon is subjected, according to a well-defined process, to track intentionally "twisted" both in magnitude and direction, the wheel-load variations are represented by means of a diagram ("torsion diagram") the special features of which depend on a certain number of parameters characteristic of the wagon: natural "out-of-planeness" of the assembly, torsional stiffness of the assembly, body hysteresis and internal friction of the suspension springs. This diagram gives some useful indications as regards the respective importance of the parameters characteristics of the wagon. Moreover, it makes it possible to determine whether a wagon tested in this way is capable or not of running with adequate safety on a track with a determined "twist". The essential points of the wheel-load diagram ("torsion diagram") are determined by means of a measuring installation, the main parts and mode of functioning of which are dealt with in the last chapter of the present report.

• 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: 1964-10

Media Info

• Features: Figures;
• Pagination: 14 p.

Subject/Index Terms

• TRT Terms: Deformation; Derailments; Dynamics; Freight cars; Measuring instruments; Prevention; Railroad rails; Railroad tracks; Safety; Tests; Torsion; Train track dynamics; Two axle cars; Wheel loads; Wheels
• Old TRIS Terms: Question b55; Track deformation
• Subject Areas: Railroads; Safety and Human Factors; Security and Emergencies; Vehicles and Equipment;

Filing Info

• Accession Number: 00052994
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: B55/RP 1/E Intrm Rpt.
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM