CN NETWORK MODEL

Computer program accepts cars, available at nodes either individually or in groups, or on trains, which are moved to destination through a network of nodes and links on trains running according to specified rules regarding the traffic handled by each train, subject to constraints of resources available at nodes, yard classification policies, rules regarding train connections, and delays due to train meets and overtakes. Results are measured in terms of the standard of service obtained from the system (car origin-destination performance) and the utilization and delays associated with nodes, links and trains. The basic objective of the model is to improve CN's ability to predict the effects of simultaneous change in the market (volume, flow and mix of traffic), service targets, operating plans and physical resources. Running time on a 370-165 for a network of 130 nodes, 275 trains per day, and 5000 cars becoming available per day is approximately 1 minute per simulated day. Post-Analysis programs require 30-60 minutes depending on the amount of output desired.

• Supplemental Notes:
  • Direct requests to Manager Operational Research Branch, Canadian National. Publications: R.D. Jones, D.C. Lach, J.W. Metsos: "The CN Network Model," paper presented at the 2nd Conference on Applications of Simulation, New York, Dec. 1968 and P.B. Wilson, C.J. Hudson: "Development, Validation and Application of the CN Network Model," paper presented at the 3rd International Symposium on Railway Cybernetics, Tokyo, Apr. 1970.
• Corporate Authors:

  Canadian National Railways

  935 la Gauchetiere Street, West
  Montreal, Quebec H3C 3N4,   Canada 
• Publication Date: 1969-6

Subject/Index Terms

• TRT Terms: Blocking; Classification yards; Computer programs; Forecasting; Freight traffic; Network analysis (Planning); Operations; Planning; Quality of service; Railroad facility operations; Scheduling; Simulation; Traffic forecasting; Travel patterns
• Identifier Terms: FORTRAN (Computer program language)
• Uncontrolled Terms: Line capacity; Network flows; Traffic patterns
• Old TRIS Terms: Ibm 370; Operating strategies; Operations planning; Train meets
• Subject Areas: Administration and Management; Freight Transportation; Planning and Forecasting; Railroads; Terminals and Facilities;

Filing Info

• Accession Number: 00131916
• Record Type: Publication
• Source Agency: Canadian National Railways
• Files: TRIS
• Created Date: Jun 5 1976 12:00AM