Wartime logistics require infrastructure depth

Synthetic-fuel capacity only helps if a modern logistics system can carry coal, chemicals, machinery, and finished products between plants and users. Reliance on coastal shipping leaves an island economy exposed to blockade, minefields, and enemy submarines. Planning around that danger demands a defensive mindset: leaders must prepare to absorb disruption rather than assume Japan will always dictate the terms of a future war. Railways are better suited to the heavy volumes of wartime mobilization, but require excess capacity before demand surges. Energy networks and internal communications also need protection, redundancy, and in some cases buried lines, despite the complications created by earthquakes. Industrial resilience depends on the transport and communications network around each factory.