The Mk I guns held an elevation of 28 degrees against the 40 degrees offered in the Mk IV gun versions. Similarly traversal was improved from 10 degrees left-and-right of centerline to a full 360 degrees in the Mk III-gunned versions.
The Mk III and Mk VI guns could reach out to target areas 17,000 yards away. Mk V guns had a range out to 21,000 yards and the Mk XIII gun followed with a 22,600 yard reach. Each gun fired a 380lb 233.7mm High-Explosive (HE) shell.
About sixteen of the large railway guns were available at the end of World War 1 in November of 1918. These remained in active circulation into the fighting of World War 2 and were mainly held back for homeland defense. They survived the Second World War of Europe only to be scrapped soon thereafter.
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