INVESTIGATION OF FAILURES IN CONTROL-COOLED RAIL

In the period between October 1, 1966 and October 1, 1967 there were seven failures in control-cooled rail, three service and four detected, investigated by the metallurgical laboratory of the AAR. Investigations 132-10A and B involved two rail specimens both having a detected transverse discontinuity in the head. These transverse discontinuities were detected by a detector car. Rail specimen 132-10A was identified as a 100-lb RE. This failure should be classified as a transverse fissure from hot torn steel. Rail specimen 132-10B was identified as a 132-lb RE. This failure should be classified as a detailed fracture from a shell. Investigations 132-12A and B involved two rail specimens both having a detected internal imperfection in the web. These internal imperfections were detected by a detector car and a hand test. Both rail specimens were identified as 132-lb RE. It was noted that both these rails have a pipe, and a non-metallic entrapment (slag) commonly associated with pipe, in the web. Investigation 135-16 involved a rail that failed in service. This rail was identified as a 112-lb RE. A photograph of the fractured faces showed a fatigue ring development. This fatigue ring development (detail fracture) started from a longitudinal separation close to the running surface of the rail head, then turned downward to form a transverse separation at a right angle to the running surface. This failure should be classified as a detail fracture from a shell. Investigation 135-28 involved a service failure that resulted from a derailment. This rail was identified as a 112-lb RE. This failure was caused by an impact force of unusually high magnitude that is believed to have been the result of a derailment. Investigation 135-29 involved a rail that failed in service. This rail was identified as a 115-lb RE. This failure was attributed to the presence of a base seam in conjunction with a high impact loading at subzero temperatures.

  • Corporate Authors:

    American Railway Engineering Association

    59 East Van Buren Street
    Chicago, IL  USA  60605
  • Publication Date: 1968-2

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 620-631
  • Serial:
    • AREA BULLETIN
    • Volume: 69
    • Publisher: American Railway Engineering Association

Subject/Index Terms

Filing Info

  • Accession Number: 00040474
  • Record Type: Publication
  • Report/Paper Numbers: Bulletin 612
  • Files: TRIS
  • Created Date: Jan 22 1976 12:00AM