Most barges with a single prop, had them fitted on the port quarter, the most popular engine was the Kelvin type of 44, 66 and 88 horsepower. Worked out at 11 hp per cylinder, hand start on petrol then change over to diesel. The only ones to have a central prop was the large Everards iron pots the Will Everard and her three sister vessels. They had Newberry engines and most of the power from the wash hit the centre post. The Kelvin type were often fitted with a combined silencer and water outlet, which used to give that memorable mist behind them as they plodded along especially on a cold day.