Salt Lake City required that the Rio Grande clean up the coal smoke crudying up their city in 1947. The 'Grande responded by putting overfire jets on the fireboxes of locomotives working into Salt Lake. But funny thing, the overfire jets, from the photos I have seen, didn't make an ounce of difference and believe the Rio Grande's powerful, huge fireboxed locomotives remained, by photographic images, the smokiest steam locomotives in the USA! The L131's and L105's looked like volcanoes!
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