FREIGHT CAR UTILIZATION AND RAILROAD RELIABILITY: AN ASSIGNED FLEET MODEL. STUDIES IN RAILROAD OPERATIONS AND ECONOMICS. VOLUME 24

This report presents a simulation model that can be used to evaluate the relative impacts of various shipper and railroad actions to improve the performance of assigned fleets. Shipper behavior is modelled as his ability to load goods, relative to his production rate and empty car availability. If empty cars are not available, the goods are stored in a warehouse. Railroad origin-to-destination performance is described by a trip time distribution, reflecting mean transit time and unreliability. At the receiver, cars are detained until demand for them arises, or they are unloaded into a warehouse. Service is measured in terms of the backlog of goods warehoused at the shipper, the number of stockouts at the receiver, and the characteristics of the queue at either end. Results of the model show that railroad operating improvements can effectively increase the capacity of the fleet. By improving mean times or reliability, railroads can improve the level of service to shippers without adding cars to the fleet. Shipper actions, such as increasing warehouse capacity, may also improve service and utilization of the fleet. The model was tested in a case study involving the Milwaukee Road and the Miller Brewing Company.

  • Supplemental Notes:
    • Also pub. as Massachusetts Inst. of Tech., Cambridge. Center for Transportation Studies, Rept. no. MIT-CTS-78-1. See also PB-275433 and PB-279642.
  • Corporate Authors:

    Association of American Railroads

    Freight Car Utilization Program, 1920 L Street, NW
    Washington, DC  USA  20036

    Massachusetts Institute of Technology

    Center for Transportation Studies, Room 1121
    Cambridge, MA  USA  02139

    Federal Railroad Administration

    Office of Policy and Program Development, 1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • ASSARABOWSKI, R J
  • Publication Date: 1978-4

Media Info

  • Pagination: 177 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00182057
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AAR-R-286 Final Rpt., FRA/OPPD-78/18
  • Contract Numbers: DOT-FR-65146
  • Files: NTIS, TRIS, USDOT
  • Created Date: Dec 3 1979 12:00AM