trans_sys_chap18

# trans_sys_chap18 - Introduction to Transportation Systems 1...

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Introduction to Transportation Systems 1

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PART II: FREIGHT TRANSPORTATION 2
Chapter 18: Measuring Origin-Destination Service and Other Rail Issues 3

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Measuring Origin- Destination Service Trip Time Histogram Schedule P (N) .1 2 .5 3 .35 4 .04 5 .01 6 2-day % N (in days) Mean Trip Time N Suppose we are using a “two-day” percent. Take a piece of paper that is two days wide; you slide it back and forth along the histogram until you find the pair of adjacent days that gives you the largest probability, as in Figure 18.1. So a particular origin- destination pair may have a two-day percent of 85%, which means that the percentage of travel time in the best contiguous two days, in this case three and four days, was 85%. In the case of a high-quality intermodal service, the two-day percent might well be 100%. Figure 18.1 4
Schedule Adherence ± Schedule adherence is a measure that can be easily manipulated. One can relax the schedule and apparently perform better in the sense that a larger number of cars are now on

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trans_sys_chap18 - Introduction to Transportation Systems 1...

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