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  Yes, but Natural gas only produces that kind of energy per volume in a liquid form. You would have to be using LNG to "beat" diesel. How much more difficult/expensive would it be do use LNG over diesel? The know-how and burners for diesel are still out there, and diesel is closer to a "traditional" fuel over Natural gas.     IIRC the French Lick Scenic railway used to have a 2-6-0 that ran on something of this sort, although I'm not sure what the fuel was. When I visited, I poked around in the cab some, and in the tender was about 10-15 rusted out pressure vessles for some kind of pressurised gas. (Natural gas, propane, maybe even oil?) One of the older guys there remembered that the arangement did not work well, something about how it was too difficult to fill that many individual tanks, and that it did not steam well (Of course, that could have been an issue with the locomotive rather than the fuel). It would make sense that they used many small tanks over one large one, since a custom-fabricated pressure-holding tank to fit the locomotive would have cost much more. This would still be an issue for a locomotive looking to convert to a pressurised fuel today.
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