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In this proceeding, the Board issued a notice of proposed rulemaking seeking public comment on its proposal to revoke the existing class exemptions under 49 CFR part 1039 for crushed or broken stone or rip rap; hydraulic cement; and coke produced from coal, primary iron or steel products, and iron or steel scrap, wastes or tailings. Following the feedback received during the course of this proceeding, the Board’s Office of Economics developed an approach for possible use in considering class exemption and revocation issues, and the Board sought comments on the approach from interested parties. Board staff held technical conferences on the proposed approach on December 18, 2020, and January 15, 2021.