What if post-war Britain rebuilt the Royal Navy while constructing an Italian-inspired high-speed rail network?
Short answerIt would be a useful step, but rail and naval orders would need wider investment in highways, the power grid, and supporting infrastructure to produce a durable recovery.
NotesNaval orders can sustain yards and skilled work, but they do not operate in an economic vacuum. High-speed rail, roads, and a national power grid also belong in the post-war package. Those systems support one another by moving workers and materials while supplying expanding industry. This answer deepens the earlier shipbuilding discussion by showing that a navy can stimulate recovery most effectively when it is part of coordinated national investment.