The concept of a Shikoku Bullet Train is currently under intense discussion in Japan. With potential to invigorate the economy of this often overlooked region, the proposal could not only spur tourism but also improve domestic connectivity. However, rigorous feasibility studies, including the project's socio-economic viability and environmental impact, are yet to be performed.

Shikoku, the smallest of Japan's four main islands, often gets sidelined in development priorities. A bullet train could undoubtedly change that, boosting regional economy and reducing geographic isolation. However, as Japan has stringent standards for public infrastructure projects, this has sparked debates on cost-effectiveness, environmental preservation, and the possible uprooting of local communities.

In the EU and the US, such infrastructural projects also typically follow strict scrutiny. In the US, for instance, California's High-Speed Rail project has faced many obstacles including finances, environmental concerns, and land acquisition issues. Similarly, the HS2 high-speed rail in the UK faced criticism regarding its economic validity and environmental impacts, mirroring Japan’s concerns.