The case for steamship (coal transport). This mod has pretty straightforward depiction of naval vessel evolution: rowing/small sail vessels, medium sail, large sail, coal ships, oil ships. Transport belongs to oil ships, while Galleon to large sails. The need for a steamship is apparent if you study carefully the tech tree. Oil based Transport comes way too late in the game with Infrastructure, which is the hardest first-tier Global tech to get (because one also need Macroeconomics). The resulting picture is that you see large sail Galleons up until WW1 and sometimes WW2. Not a happy picture. I suggest Steamships to have the same Cargo space as Galleon (3) but double the MPs. Metallurgy is a very good tech to introduce it.