EPA Exemption for Steam Engines
Title 40 -> Chapter I -> Sub-chapter U -> Part 1033 -> §1033.5 Exemptions and exclusions.
(a) Subpart G of this part exempts certain locomotives from the standards of this part.
(b) The definition of “locomotive” in §1033.901 excludes certain vehicles. In general, the engines used in such excluded equipment are subject to standards under other regulatory parts. For example, see 40 CFR part 1039 for requirements that apply to diesel engines used in equipment excluded from the definition of “locomotive” in §1033.901. The following locomotives are also excluded from the provisions of this part 1033:
(1) Historic locomotives powered by steam engines. For a locomotive that was originally manufactured after January 1, 1973 to be excluded under this paragraph (b)(1), it may not use any internal combustion engines andmust be used only for historical purposes such as at a museum or similar public attraction.
General Guidelines
CDPHE is State Agency in charge of air regulation.