At Finstdbru there were a large amount of wood piles. This was common in Norway up to the 1960ties. If you scroll back to the airfoto, you will see them in the middle of the picture. Here is a cutout of the larger picture:

 

Last year I started the process of building up to 60 such piles. I use mostly 1mm balsa sheets for the stacked  plancks and 0,5mm balsa for the pitched "roof". There are about 500-700 placks in each pile. Today, at the 21st of dec. 2020, I have built 31 piles, but half of them without "roof" because I have no more 0.5mm sheets of balsa. This thin sheet seems to be difficult to obtain nowadays.

Here is a picture of the real piles at UHB

Plankestabler-ved-aurskog-holandbanen 

And her is some of mine 

The real piles at UHB was placed on concrete bases. W have found two types still laying around at the old sawmill places along the railway.

Here is a picture by Christer found at Bjørkelangen:

And here is my  two 3D printed versions:

And here is a test under a pile: