§ 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