In 1918 the Allies built several super-heavy railway artillery pieces.
Top:
British 14in Gun Mk III.
The British Army built four super-heavy railway guns using 14in naval barrels
Bottom:
French 520mm Obusier Mle 1916.
The largest calibre railway gun built by any army during the war.
FROM: Osprey Publishing's, 'Railway Guns of World War I'
PRICE: £200.00 (unframed)
SIZE: Image approx. H 30 cm x W 40 cm (H 12 x W 16 inches)
MEDIUM: Watercolour