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There are 19 trade ships capable of carrying Container wares, although 8 are also able to carry at least one other cargo type. Eighteen are designated as "Trade" whereas the Phoenix Marauder is a "Fight" ship (see here for info on the significance of that). For Energy, Bulk and Liquid, there is one less ship because the Sanahar only comes in a Container class.
Statistics for the above-mentioned ships all of them can be found in the tables belowtable below (based on ship data linked from here ), and notes on trends and outliers follow.
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