The railgun question is initially heard as one about railway guns, prompting a counterfactual in which artillery development continues without a First World War until the mid or late 1920s. Because railway guns often borrowed weapons from ships, larger naval calibers would give land forces access to larger mobile guns as well. The exchange illustrates the technological connection between naval ordnance and railway artillery.
Notable Point · 53:39-54:11
How a delayed First World War might enlarge railway guns
Before the question is clarified as electromagnetic railguns, a brief counterfactual links larger naval artillery to still heavier railway guns.