K-Wagen
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The Großkampfwagen or "K-Wagen" was a German super-heavy tank, two prototypes of which were almost completed by the end of World War I. Wikipedia
Length: 13 metres (42 ft 8 in)
Armor: 30 mm
Crew: 27
Engine: 2 x V6 Daimler; 650 hp (480 kW)
Main armament: 4 x 77 mm guns
Maximum speed: 7.5 kilometres per hour (4.7 mph)