From Berkhamsted the canal climes up the Chiltern Hills to the summit level at Cowroast through 6 locks. Before a pump was installed there were long lines of working boats waiting to cross over due to lack of water. Three miles north west gets to Bulbourne in company with a Roman road and a railway. Robert Stevenson had built the railway cutting back in 1834. I may have seen some remains of the broad gauge track covered in grass. Found a space near the 19th century workshops where BW make lock gates.