SAFETY DEVICES FOR TRACK LAID ON CONCRETE ON STEEL SLEEPERS. THE ELECTRICAL INSULATION OF RAILS ON CONCRETE SLEEPERS
This report deals with the insulation resistance of a concrete sleepered track section (electrical resistance between the rails). The increased use of concrete sleepers in the open track has given rise to difficulties in the case of long track circuits as required for automatic block installations. According to the location of the track section and the design of the concrete sleeper, these difficulties, arising from insufficient insulation resistances of the section, were of a more or less serious nature. The results of these measurements show that most concrete sleeper designs with the insulating means used in the test sections can only guarantee the minimum insulating values for the operation of track circuits under favorable conditions, i.e. when the ballast bed is dry; under unfavorable conditions, such as, for example, prolonged rain, large moisture content of the ballast bed, the values of the insulation resistance of concrete sleepered sections are decreased to magnitudes lower than the required minimum values, i.e. much lower than those of wooden sleepered sections.
- Restrictions on the use of this document are contained in the explanatory material.
International Union of RailwaysOffice of Research and Experiments
- Publication Date: 1963-10
- Features: Figures;
- Pagination: 32 p.
- TRT Terms: Communications; Concrete; Concrete ties; Electric insulating materials; Insulating materials; Interference; Moisture content; Rail fasteners; Railroad ties; Signaling; Stray currents; Track circuits; Wood ties
- Old TRIS Terms: Leakage current; Question a25; Wooden cross ties
- Subject Areas: Materials; Operations and Traffic Management; Railroads;
- Accession Number: 00052821
- Record Type: Publication
- Source Agency: International Union of Railways
- Report/Paper Numbers: A25/RP 7/E Intrm Rpt.
- Files: TRIS
- Created Date: Jul 8 1994 12:00AM