trans_sys_chap13

trans_sys_chap13 - a highway. Fixed rails provide guidance...

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Introduction to Transportation Systems 1
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PART II: FREIGHT TRANSPORTATION 2
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Chapter 13: Railroads: Introductory Concepts 3
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Railroads ± We start with a discussion of railroads for two reasons. ± First, it is an important freight mode in many countries. ± Second, it is a good illustrative mode. We can use it to introduce concepts that are relevant to other modes as well. 4
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A Venerable Mode Badnall, Richard, A Treatise on Railway Improvements , Sherwood, Gilbert and Piper, London, England, 1833 . 5
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Rail Technology -- A Basic View ± Modern railroads are based on the technology of steel-wheel on steel- rail. ± Power is provided by locomotives; diesel and electrical locomotives are in common usage. A suggested reference for those interested in understanding the technological concepts behind how railroads operate: Armstrong, John H., The Railroad: What It Is, What It Does , Simmons- Boardman Books, Inc., Omaha, NE, 1993. 6
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Low-Cost Transportation ± Rail is fundamentally different in operation from
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Unformatted text preview: a highway. Fixed rails provide guidance and control. There are traction characteristics in steel-wheel on steel-rail that differ greatly from rubber tire on concrete or asphalt. Spend money on a specialized right-of-way limited to particular kinds of vehicles: locomotives and freight and passenger cars. By developing this high-cost, specialized right-of-way, we gain tremendous operating advantage in our ability to haul freight, often bulk commodities like coal and grain, at reasonable speed, safely and at low cost . 7 Railroad Cost Function Total Cost Fixed Cost Ton-Miles Figure 13.1 8 Railroad Average Cost Function Average Cost/ Ton-Mile Ton-Miles Figure 13.2 9 Rail vs.Truck Cost Functions Costs Truck Rail Ton-Miles Figure 13.3 10 Freight Car Types (1) Box car Conventional Flat Car Double-stack Gondola Car Figures 13.5, 13.6 11 Freight Car Types (2) Tank cars Refrigerator Cars Auto-Rack Cars 12...
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trans_sys_chap13 - a highway. Fixed rails provide guidance...

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