The first 6 ships were ordered from commercial yards (Money Wigram & Son, C J Mare & Co and J Scott Russell), with fitting out to be done in the Royal Dockyards at Chatham (first pair) and Woolwich (last 4).
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Highflyer was built at Leamouth Wharf by C J Mare & Co., while Esk was ordered from the Millwall yard of J. Scott Russell & Co. on the River Thames.
On 31 January 1858, the largest ship of that time, the SS Great Eastern designed by Isambard Kingdom Brunel, was launched from Napier Yard, the shipyard leased by Messrs J Scott Russell & Co.