

The answer is in the first few words of the article, “Finland’s track gauge is the same as Russia’s was in the late 19th and early 20th century— 1,524mm — which is 89mm wider than the European standard.”
So again, why is it that you oppose this change?
My first guess, and the apparent reason for doing this is simple. Russian trains can currently run right into Finland, and this change will stop that route of invasion.
“Finland’s track gauge is the same as Russia’s was in the late 19th and early 20th century— 1,524mm — which is 89mm wider than the European standard.”