Railroads and the Environment : Estimation of Fuel Consumption in Rail Transportation : Volume 3. Comparison of Computer Simulations with Field Measurements
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1978-09-01
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Edition:Technical report; Jun 1977-Jun 1978
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-Rail Energy and Environment;NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;NTL-RAIL TRANSPORTATION-Rail Energy and Environment;
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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 deviations. Uncertainty is 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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