'Travel only when you Must', World War II poster, 1939-1945.
© NRM / Pictorial Collection / Science & Society Picture Library
Travel only when you Must - Coal & Food & Guns come first - Tracks are filled with War-Time Traffics'. Poster produced during World War II to convey the railways' priority of transporting vital war supplies before normal pasenger traffic. Pasengers were thus advised to avoid making unnecesary journeys which delayed war traffic.