trans_sys_chap14

trans_sys_chap14 - Introduction to Transportation Systems 1...

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Introduction to Transportation Systems 1
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PART II: FREIGHT TRANSPORTATION 2
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Chapter 14: Railroad Operations 3
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Path from Shipper to Receiver Train AB Shipper Local Train A B Train EB Train BD E C Train BC Local Train Receiver D F 4
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Blocking Patterns Train AB E D C B Train EB A D C B Train BC C Train BD D + F D and F randomly ordered or F D D and F traffic is blocked 5
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Consolidation ± A Key Concept: Consolidation ± The railroad system is a high fixed cost system. Take traffic from E and A destined for C and block it into a single set of cars that will go together from B to C at presumably lower cost than in the case of A-C and E-C traffic going separately. 6
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Train Operating Costs vs. Train Length Train Operating Costs additional power Train Length (cars) Figure 14.3 7
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± The operating policy to generate cost savings through consolidation implies stiff penalties when things go wrong. The reason that we run only one train a day from B to C is to achieve long train lengths. ± Often we operate with 24-hour service headways; if the cars from E to B destined for this outbound train going to C misses that connection for whatever reason, this can
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This note was uploaded on 12/06/2011 for the course ESD 1.221j taught by Professor Josephsussman during the Fall '04 term at MIT.

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trans_sys_chap14 - Introduction to Transportation Systems 1...

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