 The route ran via Millerhill village and Hardengreen, crossing the North Esk on a bridge high, and the main line was about long.The Fisherrow branch from Niddry (later spelt Niddrie) opened on the same day; the junction at Niddry was facing for trains from St Leonards.Fisherrow had a small fishing harbour, and offered the possibility of transferring coal to coastal shipping.