This is a strategic move: it makes it easier to move weapons within Europe and makes it much harder for Russia should they invade.
Ideally you would want to do this all over Europe.
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Ideally you would want to do this all over Europe.
Not just for military purposes either, economically it makes sense. Trains can just keep going to the edges instead of having to stop and their cargo moved to a different gauge. I've heard they're planning on doing the same in the Baltic states.