e8 diesel locomotive
When tractors were first developed, they used enormous steam engines which were notoriously unreliable and challenging to maintain. These were phased out round the turn in the 20th century and substituted with internal combustion engines that have been more compact yet still powerful and ran on the variety of fuels including kerosene, ethanol and gasoline. By the 1960s many of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. "And I saw three unclean spirits like frogs come out of the mouth in the dragon, out from the mouth with the beast, and out with the mouth with the false prophet. For those are the spirits of demons , performing signs, which are in the market to the kings in the earth and in the whole world, to assemble these phones the battle of the great day of God Almighty." Rev. 16:13,14. (It's the battle of Armaggedon - [see verse 16], that involves the worlds leaders [vs 14] and comes about after time, as Jesus announces He is planning to return [see vs 15]).