PROBLEMS IN THE OPERATION OF RAILROADS
VOPROSY EKSPLYATATSII ZHELEZNYKH DOROG
This issue presents the following five reports. (1) Optimal distribution of tractive power based upon the weight and speed of the cargo train on a computed profile. This report reveals methods, norms, and results of research with the use of electronic computers on calculated speeds for various existing types of locomotives and over long-term conditions. Used as the optimality criterion is hourly productivity of the locomotive (train). Transport expenditures are detailed. Calculated speeds at the present time are optimal in none of the criteria; a differentiation of calculated speeds independently of track profile is recommended. (2) Composition of passenger and cargo train traffic schedule on two-track sections. This report shows that the least delay of trains of various categories during passage on a section is derived from simultaneous composition of their traffic timetable. An algorithm is proposed which takes into account simultaneous plotting of various categories of trains. (3) Optimization of the network schedule for terminal operation of circuit and railroad tracks of industrial enterprises. Choice of the optimal variant is accomplished according to hierarchical criteria; these are technological, cost, and operational. The indices of these criteria are respectively, volume of switching rail cars, average idle period, and operational interaction between the station and industrial tracks; expenditures for switching the rail car. The final criterion is characterized by a minimum of maximal mismatches during fulfillment of the network timetable. (4) Influence of the irregular flow of loads on parameters of terminal arrangements. The report presents methods for the analytical expression of flows on requirements and service at the terminals, as well as conditions of interaction between these two flows. Also the statistical modeling method as applied to the definition of fundamental processes together with the analytical dependence. On the basis of research into the processes, including irregularity, methods for locating their basic parameters are proposed. (5) Formation of the casual full-scale plate on the electronic computer, depending upon the rail car flow; this presents the influence of the volume and nature of the rail car flow on the splitting up of carrier trains on junction cargo stations.
- Abstract only is available in English, original untranslated as of November 1976.
Institute of Engineers for Railroad TransportationUSSR Ministry of Railways
- Publication Date: 1971
- TRT Terms: Car utilization (Railroads); Classification yards; Double track; Mathematical models; Network analysis (Planning); Operations; Planning; Railroad facility operations; Scheduling; Simulation; Statistical analysis; Timetables; Tonnage ratings; Train operations; Yard operations
- Uncontrolled Terms: Line capacity; Network flows
- Old TRIS Terms: Operating strategies; Operations planning; Train performance; Yard simulation models
- Subject Areas: Administration and Management; Data and Information Technology; Freight Transportation; Planning and Forecasting; Railroads; Terminals and Facilities;
- Accession Number: 00130234
- Record Type: Publication
- Source Agency: Federal Railroad Administration
- Report/Paper Numbers: No. 360 Report
- Files: TRIS, USDOT
- Created Date: Nov 23 1977 12:00AM