Can steam locomotives be sustainably operated?
Steam traction is unique in its capability to burn almost any solid or liquid form of bio-fuel. Steam locomotives in the past have successfully burned carbon-neutral fuels such as wood, biomass, coconut fibre, sugar-cane waste and the only limit to these sort of fuels is the calorific value available (Newman, 2008 Feasibility of steam traction for coal transportation in developing countries). The Grand Canyon Railway in the United States has successfully fuelled its 1923-built steam locomotive on recycled vegetable oil, one of many actions undertaken in the process of gaining ISO-14001 certification of its environmental management system. The vegetable oil is filtered and centrifuged to remove particulates and remove water introduced by cooking processes – which is a very low level of refinement. [ www.thetrain.com/Steam-Event-7275.html ]
Provided that sustainable sources of biofuel are available at required calorific value, it is highly probable that the Rimutaka Incline Railway operation can become carbon-neutral.