 These rectilinear forms were complemented from the mid-19th century with more serpentine forms, starting with Cockburn Street, laid out by Peddie and Kinnear in 1856, which specifically improved access between the Royal Mile and the newly rebuilt Waverley Station.The Edinburgh City Improvement Act of 1866 further added to the north south routes.This was devised by the architects David Cousin and John Lessels.