Original: 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.
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.