In seeking to re-regulate the railroads, Biden seeks to undo the legacy of deregulation left by President Carter and Senator Ted Kennedy, whose achievements made the U.S. transportation system the most efficient in the world and cut the cost of moving people and goods in half. On antitrust enforcement, Mr Biden seeks to roll back nearly half a century of bipartisan reforms that have dismantled progressive-era regulation and dramatically increased productivity, particularly in transport and high-tech communications.

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Explanation:

It sounds like you're summarizing some points from the article you mentioned earlier. It appears that the authors are discussing President Biden's proposed policies regarding re-regulation of certain industries, particularly railroads and antitrust enforcement. They argue that these policies aim to undo the legacy of deregulation from previous administrations, such as President Carter and Senator Ted Kennedy, which they claim contributed to the efficiency of the U.S. transportation system and increased productivity in certain sectors.