In 1914 three locomotives stationed in the depot Tergenier, Nord 3.414, 3.418 and 3.508, were lost due to World War I.

[1] In the period of 1915-1917 the locomotives then were confined to the depots La Chapelle, La Plaine, Creil, Hazebrouck, Dunkerque, Calais, Amiens, Boulogne, Compiègne, Longueau, Béthune, Abbeville and Valenciennes.

[1] In 1918 a locomotive of this series, the Nord 3.438, was used to pull the Armistice train to the Forest of Compiègne.

[2] Early 1920 to 1925 the locomotives were then allocated to the depots La Plaine (4), Creil (3), Crépy (2), Soissons (2), Compiègne (8), Estrées (4), Somain (18), Arras, Délivrance (1), Amiens (7), Longueau (2), Le Tréport (12), Beauvais (3), Cambrai (8), Hirson (11) and Hazebrouck (26).

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