HUMP YARD SIMULATION

Simulation of the hump yard sorting process is only possible by means of a random model. The variables of this model are the sequence and direction of the cuts and the resistance to rolling. In connection with the resistance to rolling other technical data typical of the different cuts need also to be given. The computer processes the train to be humped on the basis of the statistical distribution curve. The stored program calculates the running data for all cuts, allowing for progressive occupation of the sorting sidings; it also initiates accurate target braking. The "distance-speed-time" data of the preceding cut are noted and the speed of the following cut is adjusted accordingly. The program also ensures that the previously stored speed limits are observed. Based on the guide numbers of the successive cuts the computer decides which switch in the splitting-up zone will be passed and what time intervals between cuts will be observed for a given safety system. The input of this program includes variables which differ considerably and the program is therefore adapted to various tests. The output indicates for each sorting siding both the length of track occupied by cuts and that still free available, the utilization factor as a percentage, and the level of energy absorbed by braking. The computer used also evaluates the sorting siding group. This program has a variant which enables the desired distance-speed-time data to be written even if the design engineer has stored in the computer the variant with the most adverse sequence of cuts. If any retarder application is required, the computer repeats the whole calculation and calculates new data of the hump dynamics for the braked section.

• Supplemental Notes:
  • This paper was presented at the Third ORE Colloquium held in Amsterdam, May 8th to 10th 1973, and its Summary is contained in the Colloquium report #AZ40/RP 5/E; See RRIS #052511. Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Authors:
  • Lehel, J
• Publication Date: 1973-6

Subject/Index Terms

• TRT Terms: Computer programs; Hump yards; Information processing; Simulation; Yard operations
• Old TRIS Terms: Question az40; Yard simulation; Yard simulation models
• Subject Areas: Data and Information Technology; Freight Transportation; Railroads;

Filing Info

• Accession Number: 00052571
• Record Type: Publication
• Source Agency: International Union of Railways
• Files: TRIS
• Created Date: Feb 27 1975 12:00AM