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| Symbol | Definitions |
|
| Set of URT stations |
| Set of spatial nodes |
| Set of platform spatial nodes, |
| Set of spatial connections, including sections and transfer links |
| Set of space-time-sequence arcs |
| Set of walking space-time-sequence arcs |
| Set of left-behind space-time-sequence arcs |
| Set of space-time-sequence nodes |
| Set of activity times |
| Set of passengers |
| Index of urban railway transit stations, |
| Set of trains passing platform |
| () | The train passing platform |
| Index of passenger, |
| Index of spatial nodes, |
| Index of time stamp, |
| Interval time at station at time |
| The station to which node belongs, |
| Index of spatial connection, |
| Index of space-time-sequence node, |
| Index of space-time-sequence arc indicating departing at during time interval and arriving at at during time interval, |
| The distribution of the time cost of space-time-sequence arc |
| The mean of the time cost of space-time-sequence arc |
| The variance of the time cost of space-time-sequence arc |
| The probability that a passenger leaves node at and arrives at node at |
| The time that a passenger should spend on |
| The number of times passengers who travel by are left-behind |
| The arrival and departure times at platform of the train, |
| The upper error limit of function value |
| The interval time of platform |
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