The production use of a ballast undercutter/cleaner on the Chicago and North Western and the machine's use in conjunction with the installation of a stabilizer fabric between the ballast section and subgrade where it is difficult to keep water away from the track is discussed. C&NW used Mirafi 140, made of two types of continuous filament fibers--one wholly polypropylene and the other a polypropylene core covered with a nylon sheath. This sheath acts to filter fine soil particles from contaminating material above the material and to support the track on the subgrade.

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  • Corporate Authors:

    Murphy-Richter Publishing Company

    20 North Wacker Driver
    Chicago, IL  United States  60606
  • Publication Date: 1976-10

Media Info

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Filing Info

  • Accession Number: 00147593
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 16 1977 12:00AM