It's been relatively easy to find power and a work surface in most of the train stations I've needed to spend time in. In the Kiruna station, there is a little room that looks like it must be used in the winter as a cafe. There is a little restaurant in a hut just outside with tables and benches on the patio, I'm guessing that in the winter they move inside or at least let you eat inside.

I keep my power strip with replaceable power cords handy and use that as my plug converter. It's bulky but it's very light and will accept jacks from any plug style. So if I need to temporarily move a country specific lamp or appliance I can.

Some places have WiFi available. There is a router here, but they seem to have DHCP turned off and I really don't need it for the few hours I'm here.