J Pullin, Sustainability on the line, Professional Engineering, 12 January 2005, p 39

In UK, the Rail Safety & Standards Board concludes that sustainability encompasses the environment, society and the economy. The problems to be faced include the slow pace of change and the longevity of rail equipment, one example of which is the consideration only now being given to low-sulphur diesel, already explored by the road transport industry. The effects on acceleration of the 2.5% lower thermal energy content of road diesel compared with rail gas oil are unknown. Low-sulphur fuels can also create leakages through seals and O-rings throughout the fuel system. Rail currently contributes just 0.1% of the UK's SO2.

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