Technical Reports

Railroad Classification Yard Technology-Assessment of Car Speed Control Systems

  • 01
  • May
  • 1980
AUTHOR: Federal Railroad Administration; Ellen S. Witt; Norka Shedlock
OFFICE: RPD
REPORT NUMBER: FRA/ORD-80/90
SUBJECT: Freight Operations
KEYWORDS: Hump yard, Retarder, Automatic speed control system, Clasp retarder, Quasi continous control
ABSTRACT: The scope of this study has encompassed an evaluation of fourteen yard speed control devices, an identification of four generic speed control systems, a qualitative assessment of the four systems, and finally a quantitative analysis of three hypothetic yards each employing a system that is considered promising. These three systems are (1) the advanced clasp retarder system, (2) the quasi-continuous control system, and (3) a hybrid system incorporating quasi-continuous control. No ranking of these three systems is possible because each has its advantages and disadvantages; and one system may be more suitable than the others under a particular circumstance.

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