Cotton Through the Blockade
Almost every bale of cotton that went out through the Confederate ports in blockade runners had been brought to the port by a railroad. Therefore, looking at the amount of cotton run out of each port will give an idea of the railroad capacity required to supply the cotton for blockade running to that port. None of these numbers are exact, but should be used to show the level of effort involved.
 

Number of 400-pound Bales Smuggled by Steamers

Year Wilmington Charleston Georgia/E. Florida W. Florida Mobile Texas Total Cars
1862 4,155 21,388 2,771 693 11,080 3,463 43,550 1,089
1863 74,790 31,713 2,078 8,311 13,850 1,385 132,127 3,303
1864 112,878 22,864 0 693 11,773 11,080 159,288 3,982
1865 1,385 8,113 0 0 693 18,006 28,197 705
Total 193,208 84,078 4,849 9,697 37,396 33,934 363,162

9,079

Number of 400-pound Bales Smuggled by Sailing Vessels
Year Carolina Ports Georgia/E. Florida Ports Gulf Ports Total Cars
1862 13,163 1,950 33,800 48,913 1,223
1863 3,738 1,625 21,125 26,488 662
1864 975 1,625 10,075 12,675 317
1865 163 0 1,138 1,301 33
Total 18,039 5,200 66,138 89,377

2,235

 
From Surdam, Northern Naval Superiority and the Economics of the American Civil War. Cars numbers are mine, based on 40 bales per car.

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