 Dudgeon also supplied the 1865 built Avalon, 670 gt, which was powered by a two-cylinder oscillating engine that gave a speed of 14 knots.When the service first started, ships bound for Rotterdam had to negotiate the Brielle Bar to enter the river Maas with access possible only at high water.Things improved in 1872 with the opening of the New Waterway which by-passed the Brielle Bar.