A system for controlling the speed of freight cars coming out of car retarders in classification yards is described. The key element of the VR-IV system is the use of an acceleration servo to cause cars to decelerate at a constant rate and achieve the proper exit speed just as they leave the retarder. This is in contrast to the velocity servo used in earlier systems. With a microprocessor, the VR-IV system continuously repeats the computation of deceleration that will produce the desired exit speed; then it operates the compressed-air application or exahust valves to produce the proper air pressure in the retarder cylinders.

Media Info

  • Media Type: Print
  • Pagination: pp 29-31
  • Monograph Title: Innovation in classification yard technology: proceedings of the third railroad classification yard workshop
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00391585
  • Record Type: Publication
  • ISBN: 0309036178
  • Files: TRIS, TRB
  • Created Date: Jan 30 1985 12:00AM