Profile: A Rail Hump Classification Yard Gradient Simulation

Details

• Creators:
  Stock, William A ; Sakasita, Masami ; Elliott, Carola ; Wong, Peter J
• Corporate Creators:
  SRI International
• Subject/TRT Terms:
  • Computer programs
  • Design
  • Hump yards
  • Railroad yards
  • Rolling resistance
  • Speed control
  • Steering
  • Wind
• Resource Type:
  Manuscript
• Geographical Coverage:
  United States
• Corporate Publisher:
  SRI International
• Abstract:
  Designers of rail hump yards traditionally go through a tedious, long manual process to optimally design the hump grades and retarder placements. This design process involves checking velocities and headways of a worst-case sequence of cars to ensure that proper values of the variables can be maintained on the gradient. This paper presents a computer simulation model, PROFILE, that automatically computes these quantities, thus freeing the designer of tedious work and more design alternatives to be generated and studied. The model uses the usual static (velocity independent) rolling resistance formulation of car rollability, but in addition offers the option of a velocity dependent rolling resistance model. The paper gives descriptions of user input requirements and program-generated output. Finally, the paper gives an example of the model’s application in a real-life design problem.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/77761/dot_77761_DS1.pdf
• File Type:
  [PDF - 5.23 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:16ec5ab62a8e644f90cfd8e797520777583d277747a8dd5a0b1e8fe92adc9fbae5ec80b03793c0b9557b30c771f277b03490868208b5ad7b337a727982c9199e