Part of a positive and powerful imaginary of Western technological progress, the aesthetic plumes and swirls of smoke belched out by locomotive engines have long been a familiar sight in industrial countries such as Britain, to the point of becoming almost a natural feature of the engine and of the urban-industrial landscape. Beyond its apparent normality however, locomotive smoke appears as the result of an unequal balance of power, as it was the source of many conflicts opposing railway interests, residents, and local authorities, from the early days of steam traction until its gradual demise from ordinary service. This observation raises the question of the role played by public opinion in the technological development of railways regarding fuel and traction policies, as much as the role played by these policies in the gradual perception of railways from a local source of nuisance to a major contributor to air pollution.

Based on ongoing PhD research, the communication will focus on the perception of railway smoke in Britain in the 20th century, from the first scientific investigations on urban air pollution to the implementation of the Clean Air Act. It will show the influence of local and national smoke abatement players and the importance of public opinion in railway modernisation plans, leading to the invention and promotion of a “clean”, environmentally friendly means of transport.