| Driver | John Cobb (Great Britain) |
| Car | Railton Mobil Special (Great Britain) |
| Date Speed | 16th September 1947 394.20 mph (m) |
| Date Speed | 23rd August 1939 369.47 mph (k) |
| Date Speed | 15th September 1938 350.20 mph (m) |
| Place | Bonneville Flats, USA. |
| Power Source | 47,872cc - 2 supercharged Napier Lion V11D (WD) aircraft engines. 24 cylinders (2 V12's). 4 wheel drive |
| Max power | 2,500 bhp |
| Length | 8.73m (28' 8") |
| Width | 2.43m(8'). |
| Height | 1.29m (4'3"). |
| Track - front | 1.67m (5' 6") |
| Track - rear | 1.06m (3' 6") |
| Weight (approx.) | 3,203kg (7,059lbs) |
| Where is it now? | Museum of Science and Industry, Birmingham, England. |
The Railton Special returned in 1939 to reclaim the record. World War II intervened, but Cobb was back in 1947 with a modified vehicle, now renamed The Railton Mobil Special, and took the record to just short of his 400 mph target. He did achieve over 400 mph in a one way run, and his record was to stand for nearly 16 years. In 1952, Cobb was killed pursuing the World Water Speed Record like his great predecessor, Segrave.
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