The railway gun is a french "obusier de 370 mm modèle 1915 sur affût à berceau" captured the 27 may 1918 in a railway-siding near the "Chemin des Dames".These guns were captured because the gunners were at work for a new battery site some 30 miles in the east in Champagne and they are no locomotive for the retreat of the guns.Germans make restitution of these guns intact in june 1919 after the signing of Versailles Treaty. The "french 370 obusiers"" captured in may 1918 were often photographied by the germans as the "12 inch british railway Howitzers" captured in march and april 1918 and photographs of all these guns are in many german newspapers dated spring 1918 and many postcards send by german soldiers at the same dates. Yours sincerely, Guy François.