A correspondent writes in,
Compare the Krupp K5 guns [1,2] to the Schwerer Gustav gun.
Railroads and these railway guns gave the mobility, power and range of battleship guns to land powers. This foreshadowed the end of domination of continental land power by sea power.
Geopolitics today concerns the unfolding social consequences of this technological evolution. Debt-based fiat currency, fractional-reserve banking and privately-owned national banks are closely identified with sea power. This puts them on the wrong side of history.
Also compare a Kalibr cruise missile (range 930 miles, payload several megatons) with a Krupp K5 gun (range 40 to 50 miles, payload 90 pounds of HE).