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var ch_queries=new Array( ); When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. 3. Lasts Longer: All there's in an electric motor is often a coil and drive-shaft, instead of the numerous moving parts in a very traditional combustion engine. As well as being ultra credible the motor will last a long time. With less moving parts to concern yourself with there is little that they will not fail.