[1] The vehicle was powered by two supercharged Napier Lion VIID (WD) W-12 aircraft engines.

Multiple engines was not a new technique, having already been used by the triple-engined White Triplex and the Railton Special's contemporary rival, Captain Eyston's twin-engined Thunderbolt.

With the huge powers thus available, the limitation was in finding a transmission and tyres that could cope.

The National Physical Laboratory's wind tunnel was used for testing models of the body.

On 16 September 1947 John Cobb averaged 394.19 mph (634.39 km/h) over the measured mile in both directions (385.6 & 403.1) to take the world land speed record, before the American Goldenrod set a new mark for piston-engined, wheel-driven LSR cars eighteen years later.