The trail here are groomed by the local snowmobile clubs. Mostly with snowmobiles, but some bigger clubs in the north have Pisten Bullys.
Most of the trails in Sweden is in the forrest, so they are narrow and curvy. So after grooming the trail does not hold so long before it starts to get bumpy.
In Sweden we are allowed to ride almost everywhere in the nature when it's enough snow.
In Finland you only can ride on the trails.
Norway has just started to allow trail riding. But their net of trails are very small, and often they lead in to Sweden so that the Norwegians can get into the snowmobile freedom of Sweden. (not so good always, for us Swedes)
This is a pic from beginning of january when I was out grooming with our Snowmover. Of course we have a Lynx to pull it, it's a 59 Yeti 600 ACE.