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Track-Related Research, Volume 7: Guidelines for Guard/Restraining Rail Installation (2010) / Chapter Skim
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Summary
Pages 1-2

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From page 1...
... The effects of vehicle types, wheel flange angle, W/R friction coefficient, curve radius, cant deficiency, and track perturbation on flange climb derailments were also investigated through NUCARS® simulations. A number of conclusions regarding guard/restraining rail installation in terms of vehicle type and track geometry are drawn from this work including the following: • Philosophy I (shared contact between the high-rail flange and the guard rail on the low-rail wheel)
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From page 2...
...  Guard rails should be installed on curves with radii less than or equal to 500 ft for Type 1 light rail vehicles running at a 4 in. cant deficiency speed with Level 2 track perturbations.
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Key Terms

  • light rail
  • guard rails
  • rail vehicles
  • climb derailment
  • guard rail

  • rail installation
  • flange angle
  • vehicles running
  • transit rail
  • wheel flange

  • derailment risk
  • friction coefficient
  • cant deficiency
  • track perturbation
  • rail cars

  • risk decreases
  • installation guidelines
  • curve radius
  • deficiency speed
  • rail flange

  • simulated transit
  • steering capability
  • prevent flange
  • installation criteria
  • climb derailments

  • distance limit
  • climb distance
  • nadal limit
  • special trackwork
  • track perturbations


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