Muretex's expertise in model based systems engineering has been applied in the transport sector. Muretex have applied systems engineering processes and, in particular, the human machine integration and command and control aspects, to the specification of an Automated Rail Repair Robot capability demonstrator (on behalf of the Transport Systems Catapult) to allow Network Rail to carry out trials. Muretex established a model based framework to manage the requirements gathering exercise and the preliminary architectural design of the system. Muretex also facilitated early workshops to engage stakeholders and users with the process and to establish user and system requirements of the autonomous system. The capability demonstrator and the ultimate system was to operate within a highly complex and regulated legacy infrastructure network and so a strong audit trail and set of traceability relationships needed to be created and maintained for use throughout the whole life-cycle of the system.