In 2018, 848 Moroccan railway workers had the French national train company convicted for national origin discrimination. In the French context, this fight and the judicial outcome are remarkable. The absence of class action and the colour blind environment have historically limited mobilization against racial discrimination. This article examines the conditions of this success despite the institutional context. Some peripheral actors tried but failed to impose a racial and post-colonial framing. Only the “national origin discrimination” framework enabled the achievement of the legal case.