Changes in transportation policy by the United States, the world's most powerful nation, consistently send powerful ripples through global industries. The recently announced strengthening of 'Buy America' standards by the U.S. Federal Railroad Administration (FRA) for railway safety systems is one such example. This policy, which combines railway transportation safety with the revitalization of domestic manufacturing in the U.S., is not merely a domestic regulation but directly impacts international supply chains and advanced technology ecosystems. It is necessary to examine what this change signifies for Korean companies, particularly those in advanced mobility and railway technology sectors. The FRA's new proposed rule requires the application of 'Buy America' requirements even to sophisticated technological devices for railway safety. This is part of the government's broader effort to revitalize domestic manufacturing by increasing the proportion of U.S.-made components for products procured with federal funds under the 'Infrastructure Investment and Jobs Act (IIJA)'. Until now, existing regulations applied 'Buy America' requirements only to specific components of railway safety systems. However, the FRA aims to expand this requirement to entire systems, increasing the minimum percentage of domestically sourced components from the current 55% to 75%. Furthermore, plans to expand it to 100% in the long term are also under discussion. A prime example is 'Positive Train Control (PTC),' a system for preventing train collisions and overspeeding. PTC is an advanced safety system that combines GPS technology, wireless communication, and computer control systems to monitor train speed and location in real-time, automatically controlling trains in hazardous situations. This system is considered a core technology for railway safety, and the U.S. government aims to significantly reduce railway accidents through its implementation. Applying strengthened 'Buy America' requirements to complex systems like PTC is expected to promote the expansion of related component and system manufacturing capabilities within the U.S. The core of these changes is, above all, the revitalization of U.S. manufacturing. This policy, pursued under the Infrastructure Investment and Jobs Act, is not merely about strengthening technical requirements but embodies a will to reshape the entire industrial infrastructure. The U.S. expects to achieve technological innovation and enhanced safety while simultaneously revitalizing its domestic manufacturing, thereby solidifying its leadership in the high-speed mobility industry. The Biden administration plans to invest tens of billions of dollars in railway infrastructure over the next five years through this act, and strengthened domestic production requirements are expected to apply to all equipment and systems procured with these funds. However, this process is not without its challenges. Industry experts point out that, given the nature of complex global supply chains, rapidly increasing the proportion of U.S.-made components in a short period is a realistically difficult task. Concerns are being raised that a sharp increase in requirements could strain supply chains or lead to project delays. Railway industry stakeholders express concerns that significantly increasing the proportion of U.S.-made components for advanced technology systems within a short timeframe might be technically and economically challenging. The Dynamics of Supply Chains Under 'Buy America' Such concerns are particularly prominent in fields like railways, where highly advanced technology and diverse elements are complexly intertwined. In the global market, railway technology cannot simply be resolved by U.S. domestic production alone. Even advanced railway safety systems like PTC are an amalgamation of components and technologies produced in various countries. Dozens of components, including sensors, communication equipment, control software, and signaling devices, must be organically combined, and each of these has been handled by specialized global suppliers. Global companies, including those from Korea, have already played significant roles in the railway sector with their high-level technological capabilities. Although Korean companies were not directly mentioned in this FRA proposal, Korea possesses world-class competitiveness in high-speed rail technology, railway signaling systems, and electric multiple unit (EMU) manufacturing. Major Korean corporations are recognized in the global market for railway vehicle control systems, Communication-Based Train Control (CBTC) technology, and power conversion devices for railways. However, even these Korean companies are highly likely to face new challenges under the pressure of the accelerating 'Buy America' policy. So, what message does this change send to Korean companies? First, if they wish to enter the U.S. market, a localization strategy is now essential. Beyond simply ex