Table 1: The previous data of the collecting, distributing, and transporting system.

Year 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 (million ton) Max. daily volume (million ton) Unloading spots Use ratio of port (%) Use ratio of unloading station (%) 2006 92.10 91 34 11 69.4 6.4 72 69.5 79.1 3 78.70 48.87 2007 90.20 116 42 11 60.1 22.4 83.2 83.23 99.87 4 82.23 49.68 2008 90.10 118 42 12 55.6 29.8 85.8 93.2 105 4 94.07 60.35 2009 90.20 129 43 14 40.9 36.5 90 90.5 111.35 5 83.43 48.81 2010 90.67 147 44 16 34.8 48.7 88.3 110.97 122.03 5 97.96 70.21 2011 90.98 147 44 16 35.5 59.6 97 120.6 129.9 5 114.49 82.48