The Rational was a British car built between 1901 and 1906 in Royston, Hertfordshire. It was an 10 hp light car, with a 2281 cc, two-cylinder engine, it had a 2-speed gearbox and chain-drive built by Heatley-Gresham Engineering Co. Ltd.. Fifteen Rational Taxis already in use in London in 1907.
Technical data x bore and stroke 10 HP at 900 Revolution per minute two Speed gearbox Top Speed in First Gear 6 Miles an Hour Top Speed in Second Gear 18 Miles an Hour
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