Public transport faces increasing challenges to provide the desired service by improving its digital integration. The gap between customer/user expectations and the service proposed by many transport operators seems very hard to overcome without a structured method. We propose using the KCP method, an innovative engineering design method to propose digital mobilities and to regenerate transport through disruptive innovations. We describe how this method has been applied inside SNCF, the French national train operator, and expose two case studies on different workshops. We conclude by showing the value that ITS and digital applications can have in reviewing classical transport, and that working on the subject can help a transport operator to go outside its classical boundaries and work on different objects.