A railway version of the Swedish heavy gun

Could Sweden develop a railway-gun version of the proposed 15-inch weapon?

A railway or other land-deployable version is considered plausible, with Sweden's well-maintained track offered as a reason to take the idea seriously.

A railway mounting would make the hypothetical heavy gun available for land operations. The answer points to stretches of Swedish railway that appeared particularly well maintained relative to their observed traffic. Another suggestion is a land-deployable version without specifying a railway mounting. The attraction is the ability to call accurate heavy fire onto a small area. No existing Swedish programme is identified.