Abstract
<p><em>Railway freight transportation is an important transport system that its reliability causes economic issues. Freight carriers require predictable travel times to schedule their programs in competitive environment, so the estimation of reliability of travel time is very important. The present study proposes a travel time index that estimates the reliability of railway freight transportation and evaluates performance as well. Travel time reliability is estimated based on the shortest path between O-D pairs. Statistical measures of travel time, defining as the ratio of the 95th percentile travel time and the shortest path mean travel time as an ideal travel time, for each obtained route are calculated according to their selected links. Experimental data on Iranian rail network has been used as case study and results revealed that the routes less than 400 kilometers should be improved in terms of their reliabilities, because they are less reliable than long distance routes.</em><em></em></p>
Highlights
1.1 Background In the 20th century, transportation programs were focused on developing transportation network infrastructures while in the 21st century the focus has shifted to network management and operations (Shawn, 2003)
The following provides a subset of travel time reliability measures that are used by different sources over time and collected in periodic special studies, estimates from continuous point-based detector data, or estimation created through simulation (FHWA, 2007)
Previous studies showed the importance of travel time reliability
Summary
1.1 Background In the 20th century, transportation programs were focused on developing transportation network infrastructures while in the 21st century the focus has shifted to network management and operations (Shawn, 2003). Travel time reliability is one of the important system performance measures for transport operations. It is an indicator for facility operational consistency over an extended period (Emam et al, 2006). There are many different definitions for travel time reliability and subsequently different measures for estimating that in transportation networks. The reliability of travel time may be more important than the travel time itself for travelers, shippers, and transport managers for planning and programming (Lyman et al, 2008). The travel time reliability of a selected railway network is estimated using empirical data set followed by comparing the new and old measures based on experimental data. Over time and collected in periodic special studies, estimates from continuous point-based detector data, or estimation created through simulation (FHWA, 2007)
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