PS Avalon was an iron paddle passenger vessel built on the River Thames for the Great Eastern Railway in 1864 for their ferry services from Harwich to Rotterdam and Antwerp. Before the end of that year she was bought by British interests to assist with the commissioning of the Confederate iron-clad CSS Stonewall, and renamed City of Richmond. After the war she was renamed Agnes Arkle and sold in Brazil in 1865.

J & W Dudgeon was a Victorian shipbuilding and engineering company based in Cubitt Town, London, founded by John and William Dudgeon.