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I think an iron-powered ship would have to be a steamship. There are still a small number of steam-turbine-powered merchant ships being built- specifically LNG

I think an iron-powered ship would have to be a steamship. There are still a small number of steam-turbine-powered merchant ships being built- specifically LNG carriers, where gas that boils off from the cargo can be used as fuel.

benibela 6y ago
In Lensmen, they build iron-powered spaceships They are far more powerful than other kinds of spaceships