Europe and the British Empire, but to many other countries as well. To the above figure must be added TO production at Ferguson Park, Detroit. Including all 'Ferguson System' tractors from May 1936 to July 1956 brings the figure to approximately 1 million. Harry Ferguson merged his worldwide companies with Massey-Harris of Toronto in July 1953, three years before TE and TO20 production ended, hence the change of name on the serial plate to 'Massey-Harris-Ferguson'. The Ferguson 35 replaced the old line in the US in 1955 and the TE20 in the UK in 1956; production in the UK starting in September of that year following re-tooling of the factory. Harry Ferguson remained Chairman of Massey Harris Ferguson until 1957, when he left over an argument over the Ferguson TE60 or LTX project as it is known. He continued his hobby of motor racing and set up Harry Ferguson Research, which produced the P99 Race car, which won the Oulton Park Gold Cup in 1961 with Stirling Moss at the wheel. Harry Ferguson later helped the development of the 4-wheel-drive system which was used in the Land Rover and the Jensen interceptor FF (Ferguson Formula) even though he had already made vehicles with a 4-wheel-drive system much earlier. Harry Ferguson died on 25 October 1960 at his home (Abbotswood, Stow on the Wold), due to a barbiturate overdose; it was never established if it was deliberate or not. Engines The engine was the Standard wet liner inline-four engine. Dimensions were: Petrol engine, 80 mm bore × 92 mm stroke, capacity 1,850 cc, compression ratio 5.77:1 Petrol-paraffin engine, 85 mm bore × 92 mm stroke, capacity 2,088 cc, compression ratio 4.5:1 The larger capacity of the petrol-paraffin engine was to compensate for the power reduction resulting from the low compression ratio. Newer versions of the petrol only engine had a 85 mm bore as well. Variants The first TE20s ran on petrol until 1949 when the TVO tractor was launched incorporating the standard engine as early TE20s used a continental Z-120. There were later versions that ran on tractor vapourising oil (TVO), sometimes called petrol-paraffin or power kerosene. Some were converted in the UK to use a 3-cylinder Perkins diesel engine. TE stood for Tractor England. TO stood for Tractor Overseas. Between 1948 and 1951, the TO20 with a Continental engine was built in Detroit, Michigan. These were built with the