Correct. Only 1 prototype was ever constructed.
Type: Tank
Place of origin: United Kingdom
Production history
Manufacturer Vickers
Number built 1
Specifications
Weight 33 long tons (34 t)
Length 24 ft 11 in (7.59 m)
Width 8 ft 9 in (2.67 m)
Height 8 ft 11 in (2.72 m)
Crew 8
Armour 13-28 mm
Main armament QF 3 pounder gun (47 mm)
Secondary armament 4 × 0.303 Vickers machine gun
Engine Armstrong Siddeley V12 petrol 370 hp (280 kW)
Transmission 4 forward, 1 reverse
Suspension coil spring bogies
Operational range 95 miles
Speed 20 mph (32 km/h)
The A1E1 design can be seen as a possible influence on the Soviet T-100 and T-28 tanks, the German Neubaufahrzeug tanks, and the British Medium Mk III and Cruiser Mk I (triple turret) tank designs. The Soviet T-35 tank was based extremely closely on its plans and layout.