The SRN4 Mk III, a British-built civil hovercraft, formerly employed ferrying passengers and cars across the English channel, weighs 310 tonnes (683,400 lb) and can accommodate 418 passengers and 60 cars. It is 56.38 m (185 ft) in length, and is powered by four Bristol Siddeley Marine Proteus engines, giving a maximum speed in excess of the scheduled permitted cross-Channel operating speed of 65 knots (120 km/h or 75 mph). Cross-channel services ceased in December 2000 when the hovercraft were replaced by slower but more economical Seacat catamarans.