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§ 1033.415 General testing requirements.
(a) Number of locomotives to be tested. Determine the number of locomotives to be tested by the following method:
(1) Test a minimum of 2 locomotives per engine family, except as provided in paragraph (a)(2) of this section. You must test additional locomotives if any locomotives fail to meet any standard. Test 2 more locomotives for each failing locomotive, but stop testing if the total number of locomotives tested equals 10.