TRACK MAINTENANCE AND HIGH CAPACITY TRUCKS

The high capacity truck from the maintenance of way standpoint is the means by which the increased gross weight of the large modern freight car is transmitted to the track, roadbed, bridges, trestles, viaducts and culverts, over which it must pass. As such, its design, dimensions and position are of vital concern to those responsible for the satisfactory operating condition of the railroad. Stress in rails and joint bars, track deflection, maximum load on ties and effect on undergrade bridges require specific consideration in determining whether or not a car can be accepted for movement; and if so whether it will be free-running or whether it will be restricted as to speed and routing. An immediate concern in relation to high capacity car trucks is the anticipated increase in shelling rail failures due to increased bearing pressure. Shelling rail failures are the result of the plastic flow of metal from the middle portion of the head toward the guage corner under high shearing stresses produced by intense wheel loads eventually starting a horizontal crack. The Joint Committee on Relation between Track and Equipment has recommended maximum axle loads of 52,800 pounds on 33 inch wheels, 58,400 pounds on 36 inch wheels, and 62,400 pounds on 38 inch diameter wheels.

  • Corporate Authors:

    Symington Wayne Corporation

    2 Main Street
    Depew, NY  USA 
  • Authors:
    • Hammond, W T
  • Publication Date: 1965-9-23

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00037713
  • Record Type: Publication
  • Report/Paper Numbers: Tech Proc
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM