Earlier quoted context omitted.
Like most such things, it's probably mostly symbolic, so politicians can say they're doing something in defiance of Russia (which is a very popular thing to do in Finland right now, or most of the west for that matter). I guess they'll back down on it when by 2032, everyone realizes it doesn't matter since wars will be fought with small autonomous drones and any railroad would be sabotaged in an instant.
What kind of ranges are you expecting from these small drones so logistics suddenly doesn’t matter? Even if something can hypothetically travel thousands of miles, designing disposable weapons with that kind of range has a real cost.
But if Putin could do that (he can't), railway gauges would be the least of our worries.