Railway Infrastructure and the Victorian Novel concludes with a brief analysis of Arthur Conan Doyle’s ‘The Adventure of the Norwood Builder’ (1903), crystallising its argument that infrastructure reshapes narrative form across genres. It asserts the critical value in maintaining dialogue between railways as built and railways as imagined in fiction and other narrative media in light of the constant interplay between engineering and authorship demonstrated throughout the book. From the midst of the ‘Infrastructural turn’, the afterword asserts the value of understanding conceptual groundwork – or conceptual infrastructure – laid during the nineteenth century when interrogating contemporary understanding of this politically, socially, and indeed historically complex term.