Floating-slab track, used by Washington Metro and Toronto Transit, is now being installed by Massachusetts Bay Transportation Authority. About 4 miles of new lines at below-grade sites will use this track structure to reduce ground-borne noise and vibration and eliminate maintenance problems associated with conventional track. Slab track and direct rail fixation eliminate problems of track settling and shifting encountered with conventional ties and ballast. Rail fastener shoulders are set into "second pour" pads placed on top of the precast concrete blocks 5 ft long and 10 ft wide. Each block is carried on four natural rubber shock absorbers supplemented by horizontal dampers of the same material. The continuously supported rail sits on stiff elastomeric strips, secured against embedded shoulders with insulated spring clips. MBTA goal is a long-life, trouble-free track structure.

  • Availability:
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    508 Birch Street
    Bristol, CT  United States  06010
  • Publication Date: 1984-4

Media Info

  • Features: Figures; Photos;
  • Pagination: 3 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00386382
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 1984 12:00AM