[MUSEUM]
Text=Displacement: 7,500-9,000 GRT|Length: 130-150 m|Beam: 20-24 m|Draft: 6-7.7 m|Mast: 22.5 m|Speed: 15-19 knots|Main Armament:Varies||Summary: Heavy Freighters ranged from 7,500-9,000 tons (GRT). Cargo capacity was between 500,000 and 750,000 cubic feet. Modern ships were powered by steam turbines or oil-fired engines. Advances such as Low-Pressure Exhausts helped steam-powered ships of this class achieve higher top speeds. The most common fuel was oil, which was cleaner and required less storage space than coal. Oil had the added advantages of requiring smaller engine room crews and producing more consistent speeds. The wartime-era mass produced C-1, C-2, and C-3 vessels were largely inspired by ships of this type. These vessels served numerous shipping companies between 1930 and 1945. During the war, neutral vessels remained unarmed. Merchants owned by belligerent nations received increasingly heavy armament as the war progressed. 
