Master thesis project in collaboration with Nederlandse Spoorwegen(NS) and University of Twente. The main objective of the project was the exploration of the future of the train door system from the perspective of the Nederlandse Spoorwegen(NS). The project explored possible design challenges and solutions for an autonomous train door system for the coming decades. An autonomous door system implies that there should be no direct involvement of NS operators in the operation of the train door system under normal circumstances. In addition to the train door itself the project covers the surrounding of the train door, including the train platform, train interior and the users. A focal point of the project is the interaction between the train door system and the train’s passengers with the intention to improve safety and the prevention of delays. Through research into the past, present and future setting of the train door system various challenges for the future train door system design have been identified. This includes a substantial study into the possible future direction of the train itself. Information regarding technology roadmaps, research papers, expert opinions, observations, European plans, trends, and extrapolation of statistics from the Centraal Bureau voor de Statistiek(CBS) have been used to determine the direction of the future. Subsequently, various design solutions for the identified challenges of the future train door system have been presented and compared in the project. This includes three vastly different show cases for the future train operation focusing either on facilitating large crowds, an aging population and the possible integration of external vehicles.