Many studies have been made by scholars and practitioners to analyze the rule of passenger waiting time. For
instance, He et al. (2006) found that the rules of passenger waiting time at Beijing railway station, Beijingxi railway
station, Guangzhoudong railway station, Hefei railway station and Wuxi railway station obeyed the logarithm
normal distribution through investigating. Ma et al. (2009) established a waiting time model on the basis of the grey
dynamic theory and Gauss fitting by adopting a method of looking over the passenger’s ticket and recording the time,
and confirmed that the grey model was more real and accurate by comparing the grey model with the logarithm
normal distribution model