The engine was fired with Welsh (Bedwas) coal having a calorific value of 13,800 B.T.U. per lb. as received, and 13,970 B.T.U. per lb. in the dry condition.
Source: wiktionary
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The engine was fired with Welsh (Bedwas) coal having a calorific value of 13,800 B.T.U. per lb. as received, and 13,970 B.T.U. per lb. in the dry condition.
Source: wiktionary