text: Named after their custom blue livery , the trains were conceived under the 1955 Modernisation Plan , to create new luxury first-class diesel express trains aimed at competing with the motor car and the emerging domestic air travel market .
simplified: Named after their custom blue livery , the trains were conceived under the railway 1954 Modernisation Plan , to create new luxury first-class diesel express trains , to compete with the motor car and the emerging domestic air travel market .