Table 2: Weight of each subsystem’s parameters.

Collecting system Transporting system Distributing system Market share of Daqin Railway’s coal transportation Loading spots 10,000-ton loading spots 20,000-ton loading spots 10,000-ton freight train per day 20,000-ton freight train per day Train density Daily average volume Max daily volume Unloading spots Use ratio of port Use ratio of unloading station 0.1728 0.2955 0.3081 0.2236 0.1956 0.2052 0.1956 0.1984 0.2052 0.2925 0.3396 0.3679