Multimodal Transport Path Selection of Cold Chain Logistics Based on Improved Particle Swarm Optimization Algorithm

Table 7

Changes in the optimal path with railway transport speed.

Speed (km/h)	Optimal path	Proportion of railway mileage (%)
40		14.68
50		12.38
60		41.70
70		100.00
80		100.00

: Highway, : Railway, : Airway.