Technical Reports

Railroads and the Environment: Estimation of Fuel Consumption in Rail Transportation- Volume III: Comparison of Computer Simulations with Field Measurements

  • 01
  • Jul
  • 1978
AUTHOR: J. Hopkins, M. Hazel, T. McGrath
OFFICE: RPD
REPORT NUMBER: FRA-OR&D-75-74.III
SUBJECT: Evaluation
KEYWORDS: Fuel Consumption, Energy Usage, Train Performance Simulation, Computer Simulation
ABSTRACT: This report documents comparisons between extensive rail freight service measurements (previously presented in Volume II) and simulations of the same operations using a sophisticated train performance calculator computer program. The comparisons cover a variety of lengthy freight movements over a differing terrain, for TOFC, boxcar, and branchline operations. The simulation shows excellent agreement (within 2%) for aggregated data, although some specific runs or run segments show substantial diviations. Uncertainty ~s typically plus or minus 10% to 15%, a range equivalent to the scatter generally found within sets of measured data. The report also includes a full description of the simulation program and a general analysis of the major factors which bear upon the validity and accuracy of train performance calculations. Proposed modifications to conventional train resistance equations are suggested.

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