Edited original or duplicate;400 feet blue plastic canister;BR TF3 reference to old railway technical films catalogue / 300 feet / 9 minutes / B&W reversal / 1941-1942 / No captions / Dated 1942 on the canister / LMS locomotives and carriages and workers seen on frames, shot showing a plane very low in the sky and approaching dangerously, then signs informing of 'Danger Gas', 'LMS Air Raid Precaution', men wearing protective equipment and respirators filmed at work, while they are cleaning and decontaminating the locomotives and carriages / Fair physical condition, clean splices between sequences and few or discreet scratches