Poster, British Railways, 'Blackout - Look Out!' by LAW. Poster depicts a man and woman on a train, the inside of the train is yellow and the outside is black, the man is stepping out of the train; text reads: 'Make sure that your train is at a station before opening the carriage door. Make sure your carriage is at a platform before attempting to alight. Make sure that you use the door on the platform side of the carriage. British Railways. GWR - LMS - LNER - SR - LT.'