Mark IX tank
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The Mark IX tank was a British armoured fighting vehicle from the First World War. It was the world's first specialised armoured personnel carrier. Wikipedia
Armour: 10 mm
Crew: 4: 1 commander, 1 driver, 1 mechanic, 1 machine gunner; up to 30 men could be carried
Engine: Ricardo 6-cylinder petrol engine; 150 brake horsepower (110 kW)
Length: 9.73 m (31 ft 11 in)
Maximum speed: 6.9 km/h (4.29 mph)
No. built: 34 (total)
Power/weight: 5.6 horsepower per tonne (4.2 kW/t)