Cruiser Mk I
| Tank, Cruiser, Mk I (A9) | |
|---|---|
| Tank, Cruiser, Mk I (A9) | |
| Type | Cruiser tank | 
| Place of origin | United Kingdom | 
| Service history | |
| In service | 1938–1941 | 
| Used by | British Army | 
| Wars | Second World War | 
| Production history | |
| Designer | Sir John Carden | 
| Designed | 1934–1936 | 
| Manufacturer | Vickers | 
| Produced | 1936–1941 | 
| No. built | 125 | 
| Specifications | |
| Mass | 12.8 long tons (13.0 t) battle weight | 
| Length | 19 ft (5.8 m) | 
| Width | 8 ft 4 in (2.5 m) | 
| Height | 8 ft 8 in (2.65 m) | 
| Crew | 6 (Commander, gunner, loader, driver, 2x MG gunners) | 
| Armour | 6–14 mm | 
| Main armament | QF 2-pdr 100 rounds | 
| Secondary armament | 3 x 0.303 Vickers machine gun 3,000 rounds | 
| Engine | AEC 179 6-cylinder petrol 150 hp (110 kW) | 
| Suspension | sprung triple wheel bogie | 
| Operational range | 150 miles (240 km) | 
| Maximum speed | 25 mph (40 km/h) | 
The Tank, Cruiser, Mk I (A9) was a British cruiser tank of the interwar period. It was the first cruiser tank: a fast tank designed to bypass the main enemy lines and engage the enemy's lines of communication, as well as enemy tanks. The Cruiser Mk II was a more heavily armoured adaptation of the Mark I, developed at much the same time.