It is diffi cult to understand railway engineers’ roles and their networks solely from the viewpoint of chronology because they worked to invent and improve railway and locomotive technologies with other engineers. Thus, we must discuss the relationship between the engineers from the viewpoint of not only competition but also cooperation and networking between engineers. This paper is structured as follows. First, I survey the engineering landscape of late 18th and early 19th century Britain to create a list of engineer. Second, I discuss the early railway engineers and their role from the late 18th to early 19th centuries. Third, I attempt to clarify the relationship between engineers and create genealogical figure of engineers. Finally, I discuss conclusions and challenges for future research.