How the important technological choices of the railway world have been or not partially determined by ecological stakes like the actors themselves perceived them ? What is the weight of mediatization of several ecological questions in the process of decision in favor of an evolution of practices inside the railway world ? Those are some of the questions that are in the heart of the research plan « Train and Ecology », created by the french association Rails & histoire (Rails & history) and directed by Arnaud Passalaqua, lecturer in contemporary history in Université de Paris (Paris University). This research plan aims at analyzing the plural links between the railway system and the environmental stakes in the long term.The creation of this blog aims to make more easily accessible to the readers the actual state of research. It will be fueled by the scientific committee of Rails & history and will include several documents in French : notes, papers, iconography, bibliograhy and reading lists as well as reports of the reunions specifically dedicated to Train and Ecology.