'Britannia' class 4-6-2 locomotive 'John Mi
© National Railway Museum / Science & Society Picture Library -- All rights reserved
Britannia' class 4-6-2 locomotive 'John Milton' on the test rig at British Railways' Rugby Locomotive Testing Station, c early 1950s. The engine runs on rollers and is connected to the equipment used to evaluate its performance. The photographer, John Click, worked as a technical assistant at the test centre.