Idk who builds them or what you consider them, guess just a regular gas engine. They ran of natural gas. We toured the natural gas pipe line boost station down in lexington. The engines were the largest I have every seen. 16 cyl I think, a head per cyl. Pistons were the size of 55 gallon drums, connecting rods the size of, well, big enough to throw a piston the size of a drum around. The turbos outside could be used as a jungle gym for fairly large kids, the radiators were small buildings. And the mufflers were like silos. They had a crane to change the oil filters it was outrageous.
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