Both the Orion 1911-12 (G1 OF 4 ships 22,500 tons) G2 of 4 ships 23,000 tons and Neptune 1911/Hercules/Colossus 19,900/20 tons both class of ships were built after Dreadnought , Bellerophon was part of the same class as Dreadnought (group 2) in at 18,600 tons, mast layout was different including 16 4in guns as apposed to Dreadnoughts 24 12pr , Group 3 included Collingwood 1910 was 500ft, ten feet longer and 19,250 tons plus 4 additional 4in guns