Icebreakers, Iron, and Operation Weserübung

Germany invaded Norway for a number of reasons, but from what I can tell it did so primarily to secure the continuous winter trade of high quality Swedish iron ore from Norwegian ports, as the Gulf of Bothnia freezes over and locks down Sweden's northern ports.

Is it possible that icebreakers could be used somewhat extensively to ensure year-round iron exports through Luleå? Was the potential expense simply too great to consider?

If icebreakers would be uneconomical or otherwise unavailable for that use, is it possible that the Swedish rail network could extend northwards with sufficient freight capacity to carry ore to other Baltic ports that do not become ice-bound?

I presume that if either or both of these are possible and occur, there is insufficient motivation for the Germans or Allies to consider military action in Norway. If Germany does not then plan to invade Norway, is it necessary to occupy Denmark? Copenhagen seems unlikely to be anything other than scrupulously neutral, and the British are almost certainly not foolhardy enough to try forcing the Baltic.
 
Seems unlikely.

The (railroad) distance between Lulea (Gulf of Bothnia) and Narvik (North Sea) is roughly 300 miles. With Kiruna roughly 100 miles to Narvil, 200 miles to Lulea. And Malmberget / Gällivare roughly equidistant from both ports. (Kiruna and Malmberget with the iron ore mines.)

If you want to transport that iron ore - say - to a Swedish port south of Stockholm you´re talking about a distance of at least 600 - 700 miles (Wikipedia says that two railway lines connected Northern Sweden to Southern Sweden at that time). So every train would have to make a trip 4 -5 times longer than before. Plus the return trip empty. You´d need 5 - 10 times as many trains to transport the same volume. How much time just to get the new trains (engines and wagons)? And who´d build them and pay for them?

And as for icebreakers.
I saw a satellite picture of the Gulf of Bothnia from January 2002. The upper half of the Gulf was "white", totally frozen over. That´s a distance of roughly 150 miles from ice-free water to Lulea. You´d need quite a few icebreakers to keep a sea-lane open. And since they weren´t needed before, they didn´t exist then. You´d need to build them which once again will take time and money.

Neither additional trains nor icebreakers existed in sufficient numbers in early 1940. You would have needed a building program in the 1930s to produce them. But why do it since transport by ship is so much cheaper?
And IIRC Hitler planned for a war in the middle of the 1940s. So why waste resources in the 1930s? Resources needed to rebuild the German armed forces. Not to mention that he was fixated on a war with Russia and not with the British Empire.
 
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