trans_sys_chap16

trans_sys_chap16 - 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 16: Car Costs and Level-of- Service 3
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A More Subtle View of Costs (1) System Options A B C D System Options - Skipping Yards - Train Frequency - Terminal Upgrading Now we have to think more subtly about what the cost structure is. To simplify, consider only how much it costs the railroad to operate the service between the two extreme points of the network, A and D (we ignore the network effects). Figure 16.1 4
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A More Subtle View of Costs (2) We subdivide operating costs into three categories: train costs; terminal operating costs; and car costs associated with the costs of owning rolling stock. Costs = Train Costs + Terminal Operating Costs + Car Costs 5
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Train Costs and Terminal Costs Train Terminal Cost Cost Train Length Volume of Cars/Trains Figure 16.2 6
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Car Costs Freight Car-Cycle ± A freight car moves through the railroad network as follows: Railroad places car at shipper siding Shipper loads car Railroad moves car through system to destination Consignee unloads car Railroad picks up empty car and places car at next shipper’s siding 7
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In equation form, we write: Car Cycle (CC) = Shipper Loading Time + Transit Time (loaded) + Consignees’ Unloading Time + Transit Time (empty) 8
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Fleet Size Calculation Assume we have a volume (V) of car-loads per day going from A to D; we can compute the number of cars, NC, we need in
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trans_sys_chap16 - Introduction to Transportation Systems 1...

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