It is very close to myrdal, at the rallarvegen. Spot is even marked on osm for some reason.

It was a lovely night, but this place is kinda weird. At like 5 i heard somebody briefly talking with an american accent. Then i thought i just must have been dreaming. 15 minutes later i heard it again. Looked out of the tent and there were five people walking around next to me. I packed my stuff and rode to a very close by, small train station, to go on the toilet and have my breakfast there, dry my tent a bit. There’s like twenty people lying around in the waiting room, sleeping. Just now a woman walked past me and i was trying to ask where they all were coming from, i said hi and ‘excuse me’ twice, but she just kept walking.

edit: Another girl came along. It’s not all that mysterious, they arrived here at 4 with a train from oslo and are just waiting for a connection.