 Further improvements followed, when negotiations with British Rail resulted in the skew bridge, which carried the Ely to Norwich line over the main drain being demolished and replaced by a culvert.This action allowed the main pumping drain to the Lark Engine to be made deeper and wider, improving flows between the two halves of Burnt Fen.Despite all the changes, the Lark Engine house still carries the inscription penned in 1842 by William Harrison, the Superintendent of the Works between 1831 and 1871.