DEVELOPMENT OF A DEVICE FOR THE DETECTION OF WHEELFLATS OF A CERTAIN SIZE. DETAILED DESCRIPTION OF THE JUL 400

The JUL 400 device developed by L.M. Ericsson, in conjunction with the Swedish State Railways, is for detecting flat wheels. It is based on the principle that a wheel with a flat loses contact with the rail briefly at speeds above 30 km/h. High-frequency signals are transmitted through test sections in each rail of a track with shot circuiting of these signals resulting from passage of each wheel. Any interruption of this short circuit produced by flats on wheel treads is interpreted in terms of the size of the defect.

• 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: 0

Media Info

• Features: Figures; References;
• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Defects; Detectors; Measuring instruments; Warning systems; Wheels
• Identifier Terms: Statens Jarnvagar
• Old TRIS Terms: Flat wheels; Question a110; Wheel flat spots
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00052737
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: A110/RP 4/E
• Files: TRIS
• Created Date: May 14 1976 12:00AM