Medium RoPax vessels are those between 10,000 and 30,000 gt and their propulsion power requirements are similar to that of comparable freight RoRo vessels, but there is a considerable increase in the hotel load needed. 4-stroke medium-speed engines feature in all but the smallest ships, where a high-speed engine may be used. LNG and dual-fuel engines have made considerable inroads into RoPax vessels in almost every size bracket as they offer an instant reduction in carbon emissions even when burning fossil-based fuels.
