The ferry's importance diminished during the 19th century, with an alternative ferry crossing operating for a while between Burntisland and Granton. By the 1870s there was an increasing call for a bridge to be built over the Forth. The idea of a bridge across the Forth had been debated frequently in the past, but the depth of the water and the hard whinstone rock base found underneath had discouraged any attempts. Work on a bridge for rail traffic eventually began in 1883, under the supervision of Benjamin Baker and John Fowler. The construction of the bridge would alter life in North Queensferry drastically. At its peak, the construction of the bridge employed over 4,000 men.