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Coal
Steam ships of old ran on coal. They had big stacks for emitting clouds of black soot. Today's ships are powered primarily by diesel fuel, which burns much cleaner.
Home heating, electricity and was traditionally used as fuel in steam engine ships and trains. Early trains all had a coal car to carry it.
Steam coal
The main fuel IS diesel fuel for both both trains and ships, most freight trains run on electric motors that are powered in most cases by diesel engined generators, while passenger trains are powered by diesel, or directly from an overhead power line, or electrified rail. Trains of course used to be powered by steam, fired by wood or coal. old sailing ships obviously used to be powered by wind and/or manpower. Later they were powered by steam, usually coal fired, and then by diesel fuel.
COAL
According to Wikipedia online encyclopedia at http://en.wikipedai.org Bunker fuel is technically any type of fuel oil used aboard ships. It gets its name from the containers on ships and in ports that it is stored in; in the days of steam they were coal bunkers but now they are bunker-fuel tanks.
The steam, created by water heated by coal or some other fuel, creates pressure when released into the cylinder, moving the piston, thus moving the train or boat forward or backward.
It depends, mostly coal.
Coal or wood
Burning fuel, which may be coal, wood, fuel oil, etc.
You have to burn fuel (be it wood, coal, fuel oil, etc) to heat the water to make the steam. Burning the fuel creates pollution.