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do steam engines use coal, did steam engines use coal, coal used in steam engines, were steam engines powered by coal, did steam engines burn coal, coal powered steam engine, do steam trains run on coal, coal fired steam engine, coal for model steam engines, coal burning steam engine, what is steam coal, steam engine coal car, steam engines still in use, steam coal and coking coal, is steam from coal harmful, coal iron and steam, steam locomotive that uses coal