So they need coal, coke, kerosene, crude oil, or charcoal for steam boilers.
Carpenters to log trees...... Probably a smelter and foundry.... Then there are mechanical trades building parts. Probably a network of guides and lighthouses.
Shipmen can be a bigger deal. The shippers in a triangle trade scheme that operates a few months a year before ice and fierce storms makes sailing unprofitable. Think of all the industries and trade skills just to keep a ship afloat not even considering the crew.
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