Locomotives of "Rocket"s era were fired by coke rather than coal. Local landowners were already familiar with the dark clouds of smoke from coal-fired stationary engines and had imposed regulations on most new railways that locomotives would 'consume their own smoke'. The smoke from a burning coke fire was much cleaner than that from coal. It was not until 30 years later and the development of the long firebox and brick arch that locomotives would be effectively able to burn coal directly.