This article, placed in the context of the 'mobility' turn in cultural and social theory, focuses on mobilities of the suffragists, Florence Luscomb and Margaret Foley between 1911 and 1915. Using letters, diaries and newspaper accounts the article illustrates how a transatlantic voyage and car rides in Massachusetts contributed to the transformations in the political strategy of the women's suffrage movement in the United States. I argue that the mobilities of Luscomb and Foley engendered new kinds of action in the public sphere undertaken by the two suffragists and their colleagues. The second argument in the article is that these mobilities are not simply the mobilities of people but the mobilities of ideas and things as well. The two women were enacting newly available forms of mobile prosthetic subjectivity.