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In page Staggers Rail Act:

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Although the 4R Act established the guidelines, the ICC at first, did not give much effect to its legislative mandates. As regulatory change began to appear from 1976 to 1979, including the phasing out of the collective ratemaking authority, most major railroads shifted away from their effort to maintain the historic regulatory system and came to support greater freedom for rail pricing, for higher and lower rail rates.[citation needed]