Railways Clauses Consolidation Act 1845

CXIVEngines to consume their Smoke.

Every locomotive Steam Engine to be used on the Railway shall, if it use Coal or other similar Fuel emitting Smoke, be constructed on the Principle of consuming and so as to consume its own Smoke; and if any Engine be not so constructed the Company or Party using such Engine shall forfeit Five Pounds for every Day during which such Engine shall be used on the Railway.