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On April 25, 1938, a landmark legal decision with far-reaching implications was handed down by the United States Supreme Court in the case of *Erie Railroad Co. v. Tompkins*. The case arose from an accident on a moonlit night in 1934, when Harry Tompkins was walking along a footpath next to the Erie Railroad's tracks in Hughestown, Pennsylvania. As a train passed, an unsecured door on one of the cars struck Tompkins, leading to severe injuries, including the loss of his right arm. Tompkins sued the Erie Railroad for negligence, but the case quickly transcended its initial facts to become a pivotal legal battle over the role of federal versus state authority in civil disputes. Before this case, a century-old precedent known as *Swift v. Tyson* (1842) allowed federal courts to apply a general federal common law in certain cases, even when state law might have dictated a different outcome. This often led to forum shopping, where plaintiffs would select federal courts over state courts to obtain more favorable rulings. At its heart, Erie Railroad Co. v. Tompkins tested whether federal courts could continue to apply their own common law or if they must defer to state law in diversity jurisdiction cases (cases involving parties from different states). In a 6-2 decision written by Justice Louis Brandeis, the Supreme Court ruled in favor of the Erie Railroad, declaring that federal courts could no longer create or apply a general federal common law when state law was applicable. Brandeis argued that the Constitution did not grant federal courts the power to create general common law and emphasized the importance of respecting states’ rights. This decision effectively overturned the *Swift v. Tyson* precedent and fundamentally shifted the balance of power between state and federal judicial systems. The Erie decision reshaped the American legal landscape and remains a cornerstone of civil procedure. For the railroad industry, it underscored the importance of adhering to state-specific regulations and laws, which could vary widely across jurisdictions. The case also highlighted the vulnerability of railroads to personal injury claims, a recurring legal and financial challenge for the industry during the 20th century.