Assertion: locomotive's fuel | /r/HasProperty | known in natural gas
Facets:
Source sentences:
text: The power source 22 may be powered by any fuel known in the art such as diesel, gasoline, natural gas, and so on, or a combination thereof.
text: The auxiliary power source 52 may be powered by any fuel known in the art such as diesel, gasoline, natural gas, and so on, or a combination thereof.