Research Article
Research on Hub-and-Spoke Transportation Network of China Railway Express
Table 5
The variables used for modelling the transportation time function.
| Parameter | Descriptions |
| | Average number of vehicles assembled for each train from non-hub to hub nodes | | Transportation time for each traffic unit between nodes | | Time required for hub k to process each traffic unit | | The ratio of the number of vehicles in the hub to the average number of vehicles in all nodes |
|
|