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and canvas tops added in Rangoon. Other similar trucks were obtained during the fall of Burma, but in the event a total of 12 trucks were left behind there. As has been mentioned earlier, the Unit took over the existing IRC fleet which was a very mixed bag. It also purchased eight Dodge 3 tonners in Chungking from Liddell and Co., a merchant house. Another addition was five 1938 Ford chassis into which replacement Hercules 4 cylinder diesel engines were fitted.
By May 1942, the Unit had a fleet of 30 trucks, and those held in Feb. 1943 are listed in Table VI. Some of these were obtained by an ingenious arrangement. Some mission organizations had purchased trucks, brought them to Rangoon and taken them up the Burma Road loaded with supplies and people. It was, however, uneconomic and difficult for the organization to run the trucks once their destination had been reached. The Unit, therefore, offered to take them over in return for 16,000 km. tons of haulage of their organizations' goods.4
With the fall of Burma, importation of fuel oil, lubricating oil, and petrol became impossible except by air. Low octane petrol and diesel fuel were available at the Yumen oilfield in Kansu, some 3,000 km. from the centre of operations. The alternative fuels were rape-seed or other vegetable oils for the diesel engines, alcohol produced from sugar cane, and 'petrol' distilled from tung (#) oil for the petrol engines. All these fuels suffer from serious shortcomings. The rape-seed oil had a high acid content which gave rapid wear on the fuel pumps, injectors, and cylinders of the diesel engines, and these were worn out after two years of hard service. The alcohol was not only expensive, it was also rationed and gave a fuel consumption double that of petrol with the engines and carburettors available. The water content of the alcohol also caused rusting in the fuel tanks. The tung oil petrol was better but cost (in October 1942) NC$130 a gallon when the exchange rate was NC$80 to 1 pound sterling.
The alternative was to convert trucks to run on gas produced from charcoal. The technical description of the system used is given later. Conversion sets were first purchased and later manufactured by the Kweiyang and Kutsing depots. Considerable skill and experience were required to operate the systems successfully, and the maximum power obtainable was perhaps 70% of that on petrol. The apparatus took up room and increased the tare of the