The service tests with various makes of K-block on the Berliner S-Bahn are described. The object of the tests was to study the interaction of the two friction elements, block/wheel. Although a strong tendency for the formation of cracks in wheel tires had occasionally been observed with K-blocks, in the service tests such a tendency could not be detected. All the stages of grooving and follow-wear were present on the tires. Similar phenomena had been observed by the SNCF on suburban services. Experience gained by the DB showed that some difficulty arose due to metallic particles sometimes becoming embedded in the braking surface of the block. K-blocks were used extensively on the London Transport Underground lines. Thermal cracking, tire spalling and wear constituted a special problem on the frequently-stopping motor coaches with heavily-loaded small diameter wheels, running in tube tunnels. The performance of a K-block depended on various parameters: characteristics of the block and of the wheel steel, application conditions, service conditions, weather, and shape of block. The development of a universal K-block would be difficult.

  • 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: 1967-3

Media Info

  • Features: Appendices; Figures; Photos;
  • Pagination: 62 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00040401
  • Record Type: Publication
  • Report/Paper Numbers: B64/RP 2/E Intrm Rpt.
  • Files: TRIS
  • Created Date: Dec 4 1994 12:00AM