Question: Which of the cases had the decision overturned, Plessy v. Ferguson or Lochner v. New York?

Plessy v. Ferguson, 163 US 537 (1896) was a landmark constitutional law case of the US Supreme Court decided in 1896.  It upheld state racial segregation laws for public facilities under the doctrine of "separate but equal".  The decision was handed down by a vote of 7 to 1 with the majority opinion written by Justice Henry Billings Brown and the dissent written by Justice John Marshall Harlan. <SEP> Lochner v. New York, 198 US 45 (1905) was a landmark US labor law case in the US Supreme Court, holding that limits to working time violated the Fourteenth Amendment.  This decision has since been overturned. <SEP> The "Lochner" era is a period in American legal history from 1897 to 1937 in which the Supreme Court of the United States is said to have made it a common practice "to strike down economic regulations adopted by a State based on the Court’s own notions of the most appropriate means for the State to implement its considered policies," by using its interpretation of substantive due process to strike down laws held to be infringing on economic liberty or private contract rights.  The era takes its name from a 1905 case, "Lochner v. New York".  The beginning of the era is usually marked earlier, with the Court's decision in "Allgeyer v. Louisiana" (1897), and its end marked forty years later in the case of "West Coast Hotel Co. v. Parrish" (1937), which overturned an earlier "Lochner"-era decision. <SEP> Eastern Enterprises v. Apfel, 524 U.S. 498 (1998), is a United States Supreme Court case in which the Court held that the Coal Industry Retiree Health Benefit Act (Coal Act) constituted an unconstitutional regulatory taking of property which required the Act to be invalidated.  The import of this decision is that it was made in the context of a purely economic regulation.  The plurality examines the statute and its resultant harm as an ad hoc factual inquiry based on factors delineated in Penn Central such as the economic impact of the regulation, its interference with reasonable investment backed expectations, and the character of the governmental action. ("Penn Central Transportation Co. v. New York City"), The decision thereby moved beyond the traditional notions of equal protection which had been applied to economic regulation since the time of ("Lochner v. New York"), requiring extreme deference to Congress, and applied a regulatory takings analysis to the problem resulting in a much less deferential result.  While the plurality recognizes that this is not a traditional takings case where the government appropriates private property for public use, they also state this is the type of case where the "Armstrong Principle" of preventing the government from forcing some people alone to bear public burdens which, in all fairness and justice, should be borne by the public as a whole.  ("Armstrong v. United States", 364 U.S. 40, 49 (1960)) However, while the plurality seems to invalidate this particular law on takings grounds, the concurrences and the dissents warn of such an analysis as this should actually be examined under substantive due process or ex post facto theories.