Wiki tells us: ''Roll-on/roll-off (RORO or ro-ro) ships are vessels designed to carry wheeled cargo such as automobiles, trucks, semi-trailer trucks, trailers or railroad cars that are driven on and off the ship on their own wheels. This is in contrast to lo-lo (lift-on/lift-off) vessels which use a crane to load and unload cargo.
RORO vessels have built-in ramps which allow the cargo to be efficiently "rolled on" and "rolled off" the vessel when in port. While smaller ferries that operate across rivers and other short distances often have built-in ramps, the term RORO is generally reserved for larger ocean-going vessels. The ramps and doors may be stern-only, or bow and stern for quick loading.''
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more... you ask me the R0-Ro train is the most exciting and innovative part of Konkan Railways. Once or twice a week a rake of 24-30 trucks leave Roha near Mumbai for Surathkal near Mangalore and vice versa. Over 2 million litres of Diesel are saved every year. Last year another R0-Ro train has started from Verna in Goa to Surathkal