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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 1033
Subpart F - Subpart F—Test Procedures
§ 1033.501 - General provisions.
§ 1033.505 - Ambient conditions.
§ 1033.510 - Auxiliary power units.
§ 1033.515 - Discrete-mode steady-state emission tests of locomotives and locomotive engines.
§ 1033.520 - Alternative ramped modal cycles.
§ 1033.525 - Smoke opacity testing.
§ 1033.530 - Duty cycles and calculations.
§ 1033.535 - Adjusting emission levels to account for infrequently regenerating aftertreatment devices.
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