MV Royal Iris
 The MV Royal Iris is a twin screw diesel-electric former Mersey Ferry. The vessel was built by William Denny & Brothers of Dumbarton (Yard No. 1448) and launched in December 1950 costing £256000.Her engines were produced by Ruston & Hornsby Metropolitan-Vickers. Propulsion: 4 oil 4SA each six cylinders driving four generators each 300 kW/300v DC-connected to two electric motors each 730shp and 2 shafts. Her maximum speed is 12 knots. Her weight is 1234 gross tonnes.