UNITED KINGDOM - DECEMBER 18: Women cleaning an electric unit on the London & South Western Railway. Carriages got very dirty from all the smoke and ash produced by the locomotive fire. At this time there were very few women working on the railways. However, during the First World War many male workers joined the army, so women were employed in their place, in a variety of roles that included blacksmiths, welders and electricians. (Photo by SSPL/Getty Images)
