Reliability of travel time is one of the important factors affecting mode choice and route choice behaviors. Recently, many studies have investigated variability of travel time and engaged in developing methodology to evaluate economic value of the travel time reliability. We have investigated the travel time reliability of the railroad from the point of departure time decision of railroad users. As the results of our previous studies, it becomes clear that railroad user prepares buffer time to deal with the delay of railroad. Furthermore, it indicates that the buffer time is influenced by several factors such as travel distance, usages frequency of railroad, and number of times of transfer. Meanwhile, reliability as a function of transport network was not considered in the previous studies. Therefore, this study aims to develop a methodology to evaluate the travel time reliability with considering the level of redundancy of the railroad network. The data collected by internet survey was utilized to estimate a departure time decision model which can describes the length of buffer time

railway, redundancy, departure time decision