A chronicle of the struggle of French railway workers during the Occupation : from carrying mail to sabotage in all its forms, their participation was total. And when the troops landed in June 1944 the railwaymen gave invaluable assistance to the French resistance fighters. Filmed at the end of the war with a non-professional cast, this film is a classic of the post-war era and a tribute to all the nameless figures who contributed to the liberation of their country.