ISO/IEC/IEEE 42010:2011 defines a system architecture as the fundamental concepts or properties of a system in its environment embodied in its elements, relationships, and in the principles of its design and evolution. Essentially, the system architecture provides concise and correct description of the system of interest. An architecture description includes one or more architecture views. An architecture view (or simply, view) addresses one or more of the concerns held by the system’s stakeholders. An architecture view is composed of one or more architecture models. An architecture model uses modelling conventions appropriate to the concerns to be addressed. These conventions are specified by the model kind governing that model. Within an architecture description, an architecture model can be a part of more than one architecture view. This case study descibes how AVION developed concise architecture of the high speed rolling stock for a prestigious UK project.