A rail garden and 17 moundettes plus an engine pulling the leaders of the Scottish Enlightenment. The Enlightenment is set against the Bloodline as two views of Scottish history. At the top, small mounds carry the signs of Enlightenment thinkers and the seventeen figures are conceived as railway carriages pulled by the engine at the front - the 'train of progress'. The row of poplar trees hold red aluminium signs with important dates and names, events and massacres that punctuated Scottish history. The bridge was designed along with engineers Scot Wilson to relate to the seven red bridges of Portrack, and the Cantilevered Bridge to its right was converted from the remains of the previous one.